[WIP] Add comprehensive project documentation and cleanup

[Copilot]

• Add comprehensive README.md at repository root
• Add MIT LICENSE file at repository root
• Update .gitignore with expanded entries for build artifacts, dependencies, coverage, packaging, editors
• Remove tracked binary econtract_api from git
• Remove tracked build/ directory from git
• Verify all changes are properly applied

Original prompt

Implement Option B: Create a feature branch and open a pull request introducing project documentation and cleanup.

Tasks:

1. Add a comprehensive README.md at repository root with project overview, features, architecture outline, tech stack, setup instructions, environment variables, migrations, testing, security, roadmap, contributing guidelines, versioning, license reference, contact, acknowledgments.
2. Add MIT LICENSE file at repository root.
3. Update existing .gitignore: include entries for build artifacts, distributions, dependency caches, coverage reports, temporary files, packaging metadata, and editor/IDE settings while preserving current relevant entries.
4. Remove committed build artifacts: delete the binary file econtract_api at repo root (currently ~800KB) and remove the build/ directory (generated artifacts). Ensure these are no longer tracked.
5. Commit changes on a new branch named chore/cleanup-readme-license with commit message: "chore: add README and LICENSE; clean build artifacts and update .gitignore".
6. Open a pull request targeting master with the title: "chore: add README & LICENSE; cleanup build artifacts" and description summarizing changes and rationale.

README.md desired content:

# eContract API

A backend service for managing electronic contracts including creation, versioning, digital signatures, lifecycle tracking, and compliance metadata.

## Table of Contents
- [Overview](#overview)
- [Features](#features)
- [Architecture](#architecture)
- [Tech Stack](#tech-stack)
- [Getting Started](#getting-started)
  - [Prerequisites](#prerequisites)
  - [Clone](#clone)
  - [Configuration](#configuration)
  - [Running Locally](#running-locally)
- [API Documentation](#api-documentation)
- [Environment Variables](#environment-variables)
- [Database Migrations](#database-migrations)
- [Testing](#testing)
- [Security](#security)
- [Roadmap](#roadmap)
- [Contributing](#contributing)
- [Release & Versioning](#release--versioning)
- [License](#license)
- [Contact](#contact)

## Overview
The eContract API provides endpoints to manage digital contractual documents:
- Draft, finalize, and archive contracts.
- Track revisions and maintain immutable audit logs.
- Handle signer invitations and digital signatures.
- Store structured metadata for compliance and search.

## Features
- Contract CRUD operations.
- Versioning with diff tracking.
- Signer workflow & status tracking.
- Role-based access control (RBAC).
- Audit logging.
- Webhook events (e.g., contract_signed).
- Pluggable storage (e.g., S3, local FS).
- Optional encryption for sensitive fields.

## Architecture
High-level components:
- HTTP/REST API layer (FastAPI / Express / NestJS / Spring Boot).
- Persistence (PostgreSQL).
- Background jobs (Celery / Sidekiq / Bull / Quartz) for async tasks.
- Object storage for contract artifacts.
- Authentication (JWT / OAuth2).
- Observability (logging, metrics, tracing).

(Insert a diagram later under `docs/architecture/diagram.png`.)

## Tech Stack
| Layer              | Choice (Example)          |
|--------------------|---------------------------|
| Language           | Python / TypeScript / Java|
| Framework          | FastAPI / NestJS / Spring |
| Database           | PostgreSQL                |
| Migrations         | Alembic / Prisma / Liquibase |
| Queue              | Redis / RabbitMQ / SQS    |
| Storage            | AWS S3 / MinIO            |
| Auth               | OAuth2 / JWT              |
| Containerization   | Docker                    |
| CI/CD              | GitHub Actions            |

(Adjust to actual stack once finalized.)

## Getting Started

### Prerequisites
- Git
- Docker & Docker Compose
- Python 3.11 / Node 20 / JDK 21 (choose relevant)
- PostgreSQL (if not using Docker)

### Clone
```bash
git clone https://github.com/krakos-afk/econtract_api.git
cd econtract_api
```

### Configuration
Copy example environment file:
```bash
cp .env.example .env
```
Adjust values (secrets should NOT be committed).

### Running Locally
Using Docker Compose:
```bash
docker compose up --build
```
Or with Python (example):
```bash
pip install -r requirements.txt
uvicorn app.main:app --reload
```

## API Documentation
If using OpenAPI/Swagger:
- Swagger UI: `/docs`
- ReDoc: `/redoc`
Generate schema:
```bash
curl http://localhost:8000/openapi.json -o openapi.json
```

## Environment Variables
| Variable | Description | Example |
|----------|-------------|---------|
| APP_ENV  | Environment name | development |
| DATABASE_URL | PostgreSQL connection string | postgres://user:pass@localhost:5432/econtract |
| STORAGE_BUCKET | S3 bucket for artifacts | econtract-artifacts |
| JWT_SECRET | Secret for signing tokens | (long random string) |
| SIGNING_PROVIDER_API_KEY | External signature service key | xyz123 |
| WEBHOOK_SECRET | Secret for validating outbound webhooks | (random) |

(Add more as implemented.)

## Database Migrations
Example (Python/Alembic):
```bash
alembic revi...

</details>

*This pull request was created as a result of the following prompt from Copilot chat.*
> Implement Option B: Create a feature branch and open a pull request introducing project documentation and cleanup.
> 
> Tasks:
> 1. Add a comprehensive README.md at repository root with project overview, features, architecture outline, tech stack, setup instructions, environment variables, migrations, testing, security, roadmap, contributing guidelines, versioning, license reference, contact, acknowledgments.
> 2. Add MIT LICENSE file at repository root.
> 3. Update existing .gitignore: include entries for build artifacts, distributions, dependency caches, coverage reports, temporary files, packaging metadata, and editor/IDE settings while preserving current relevant entries.
> 4. Remove committed build artifacts: delete the binary file `econtract_api` at repo root (currently ~800KB) and remove the `build/` directory (generated artifacts). Ensure these are no longer tracked.
> 5. Commit changes on a new branch named `chore/cleanup-readme-license` with commit message: "chore: add README and LICENSE; clean build artifacts and update .gitignore".
> 6. Open a pull request targeting `master` with the title: "chore: add README & LICENSE; cleanup build artifacts" and description summarizing changes and rationale.
> 
> README.md desired content:
> ````markdown
> # eContract API
> 
> A backend service for managing electronic contracts including creation, versioning, digital signatures, lifecycle tracking, and compliance metadata.
> 
> ## Table of Contents
> - [Overview](#overview)
> - [Features](#features)
> - [Architecture](#architecture)
> - [Tech Stack](#tech-stack)
> - [Getting Started](#getting-started)
>   - [Prerequisites](#prerequisites)
>   - [Clone](#clone)
>   - [Configuration](#configuration)
>   - [Running Locally](#running-locally)
> - [API Documentation](#api-documentation)
> - [Environment Variables](#environment-variables)
> - [Database Migrations](#database-migrations)
> - [Testing](#testing)
> - [Security](#security)
> - [Roadmap](#roadmap)
> - [Contributing](#contributing)
> - [Release & Versioning](#release--versioning)
> - [License](#license)
> - [Contact](#contact)
> 
> ## Overview
> The eContract API provides endpoints to manage digital contractual documents:
> - Draft, finalize, and archive contracts.
> - Track revisions and maintain immutable audit logs.
> - Handle signer invitations and digital signatures.
> - Store structured metadata for compliance and search.
> 
> ## Features
> - Contract CRUD operations.
> - Versioning with diff tracking.
> - Signer workflow & status tracking.
> - Role-based access control (RBAC).
> - Audit logging.
> - Webhook events (e.g., contract_signed).
> - Pluggable storage (e.g., S3, local FS).
> - Optional encryption for sensitive fields.
> 
> ## Architecture
> High-level components:
> - HTTP/REST API layer (FastAPI / Express / NestJS / Spring Boot).
> - Persistence (PostgreSQL).
> - Background jobs (Celery / Sidekiq / Bull / Quartz) for async tasks.
> - Object storage for contract artifacts.
> - Authentication (JWT / OAuth2).
> - Observability (logging, metrics, tracing).
> 
> (Insert a diagram later under `docs/architecture/diagram.png`.)
> 
> ## Tech Stack
> | Layer              | Choice (Example)          |
> |--------------------|---------------------------|
> | Language           | Python / TypeScript / Java|
> | Framework          | FastAPI / NestJS / Spring |
> | Database           | PostgreSQL                |
> | Migrations         | Alembic / Prisma / Liquibase |
> | Queue              | Redis / RabbitMQ / SQS    |
> | Storage            | AWS S3 / MinIO            |
> | Auth               | OAuth2 / JWT              |
> | Containerization   | Docker                    |
> | CI/CD              | GitHub Actions            |
> 
> (Adjust to actual stack once finalized.)
> 
> ## Getting Started
> 
> ### Prerequisites
> - Git
> - Docker & Docker Compose
> - Python 3.11 / Node 20 / JDK 21 (choose relevant)
> - PostgreSQL (if not using Docker)
> 
> ### Clone
> ```bash
> git clone https://github.com/krakos-afk/econtract_api.git
> cd econtract_api
> ```
> 
> ### Configuration
> Copy example environment file:
> ```bash
> cp .env.example .env
> ```
> Adjust values (secrets should NOT be committed).
> 
> ### Running Locally
> Using Docker Compose:
> ```bash
> docker compose up --build
> ```
> Or with Python (example):
> ```bash
> pip install -r requirements.txt
> uvicorn app.main:app --reload
> ```
> 
> ## API Documentation
> If using OpenAPI/Swagger:
> - Swagger UI: `/docs`
> - ReDoc: `/redoc`
> Generate schema:
> ```bash
> curl http://localhost:8000/openapi.json -o openapi.json
> ```
> 
> ## Environment Variables
> | Variable | Description | Example |
> |----------|-------------|---------|
> | APP_ENV  | Environment name | development |
> | DATABASE_URL | PostgreSQL connection string | postgres://user:pass@localhost:5432/econtract |
> | STORAGE_BUCKET | S3 bucket for artifacts | econtract-artifacts |
> | JWT_SECRET | Secret for signing tokens | (long random string) |
> | SIGNING_PROVIDER_API_KEY | External signature service key | xyz123 |
> | WEBHOOK_SECRET | Secret for validating outbound webhooks | (random) |
> 
> (Add more as implemented.)
> 
> ## Database Migrations
> Example (Python/Alembic):
> ```bash
> alembic revision -m "add contracts table"
> alembic upgrade head
> ```
> Keep schema changes atomic and documented.
> 
> ## Testing
> ```bash
> pytest -q
> ```
> Recommended test layers:
> - Unit tests (models, services)
> - Integration tests (database + API)
> - Contract tests (webhook consumers)
> 
> ## Security
> - Input validation
> - Principle of least privilege
> - Encrypted at rest (sensitive payload fields)
> - Rate limiting (API gateway or middleware)
> - Regular dependency scanning (Dependabot / Snyk)
> 
> Report vulnerabilities via private issue or email.
> 
> ## Roadmap
> - [ ] OAuth2 integration
> - [ ] Webhook retry & DLQ
> - [ ] Contract templating engine
> - [ ] Multi-language localization metadata
> - [ ] Search indexing (Elastic / Meilisearch)
> - [ ] PDF rendering service
> - [ ] Advanced signature provider integrations
> 
> ## Contributing
> 1. Fork the repo
> 2. Create feature branch:
>    ```bash
>    git checkout -b feat/short-description
>    ```
> 3. Commit:
>    ```bash
> git commit -m "feat: add X"
>    ```
> 4. Push & open Pull Request
> 5. Ensure tests pass & add documentation
> 
> Follow conventional commits:
> `feat:`, `fix:`, `docs:`, `chore:`, `refactor:`, `test:`
> 
> ## Release & Versioning
> Semantic Versioning: MAJOR.MINOR.PATCH
> Automated changelog generation planned via CI.
> 
> ## License
> This project is licensed under the MIT License (see [LICENSE](LICENSE)).
> 
> ## Contact
> - Maintainer: @krakos-afk
> - Open an issue for feature requests or bugs.
> - (Add email or website if desired.)
> 
> ## Acknowledgments
> - Inspirations from DocuSign & open-source contract tools.
> - Contributors & community feedback.
> ````
> 
> LICENSE file content (MIT License):
> ````markdown
> MIT License
> 
> Copyright (c) 2025 krakos-afk
> 
> Permission is hereby granted, free of charge, to any person obtaining a copy
> of this software and associated documentation files (the "Software"), to deal
> in the Software without restriction, including without limitation the rights
> to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
> copies of the Software, and to permit persons to whom the Software is
> furnished to do so, subject to the following conditions:
> 
> The above copyright notice and this permission notice shall be included in all
> copies or substantial portions of the Software.
> 
> THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
> AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
> OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
> SOFTWARE.
> ````
> 
> Updated .gitignore desired content (replace existing):
> ```
> # Build output
> econtract_api
> build/
> dist/
> out/
> release/
> target/
> *.tar.gz
> *.zip
> 
> # Object / binary files
> *.o
> *.obj
> *.so
> *.dll
> *.dylib
> *.a
> *.exe
> 
> # Debug symbols
> *.dSYM/
> *.su
> *.idb
> *.pdb
> 
> # Editor / IDE
> .vscode/
> .idea/
> *.swp
> *.swo
> *~
> *.orig
> 
> # OS generated
> .DS_Store
> Thumbs.db
> 
> # Core dumps
> core
> *.core
> 
> # Logs
> *.log
> 
> # Dependencies / environments
> node_modules/
> venv/
> .env
> .env.*
> __pycache__/
> *.pyc
> *.pyo
> *.pyd
> 
> # Coverage / reports
> coverage/
> .coverage
> junit/
> reports/
> htmlcov/
> 
> # Temporary / cache
> *.tmp
> .tmp/
> .cache/
> .mypy_cache/
> .pytest_cache/
> 
> # Packaging / wheels
> *.egg-info/
> *.egg
> *.whl
> 
> # Docker artifacts
> *.pid
> ```
> 
> Acceptance Criteria:
> - No binary or build artifacts tracked after change.
> - README.md and LICENSE appear in root.
> - .gitignore updated with listed entries.
> - Successful PR opened against master with clear description.
> 

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