Add contributing guidelines for the project

Added a detailed contributing guide for the Student Management System, outlining steps for forking, cloning, branching, setting up the project, making changes, committing, pushing, and raising pull requests.

Author: prashantpiyush1111

CONTRIBUTING.md

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+# Contributing to Student Management System
+
+Thank you for your interest in contributing! Please follow the steps below carefully.
+
+---
+
+## Step 1: Fork the Repository
+
+Click the Fork button on the top right of this page.
+This creates a copy of the repo in your GitHub account.
+
+---
+
+## Step 2: Clone Your Fork
+
+git clone https://github.com/YOUR_USERNAME/student-management.git
+cd student-management
+
+---
+
+## Step 3: Create a New Branch
+
+Never commit directly to main. Always create a new branch.
+
+git checkout -b feature/your-feature-name
+
+Branch naming rules:
+- New feature  → feature/your-feature-name
+- Bug fix       → fix/your-bug-name
+- Documentation → docs/your-doc-name
+
+---
+
+## Step 4: Setup the Project Locally
+
+1. Start MySQL and create database:
+   CREATE DATABASE IF NOT EXISTS studentdb;
+
+2. Create src/main/resources/application.properties:
+   server.port=8082
+   spring.datasource.url=jdbc:mysql://localhost:3306/studentdb
+   spring.datasource.username=root
+   spring.datasource.password=your_password
+   spring.jpa.hibernate.ddl-auto=update
+
+3. Create .env file in root:
+   ADMIN_USERNAME=your_username
+   ADMIN_PASSWORD=your_password
+   DB_URL=jdbc:mysql://localhost:3306/studentdb
+   DB_USERNAME=root
+   DB_PASSWORD=your_password
+   PORT=8082
+
+4. Run the project:
+   mvn spring-boot:run
+
+5. Open browser:
+   http://localhost:8082
+
+---
+
+## Step 5: Make Your Changes
+
+- Follow standard Java naming conventions
+- Add comments where necessary
+- Keep methods small and focused
+- Do not push application.properties or .env files
+
+---
+
+## Step 6: Commit Your Changes
+
+git add .
+git commit -m "Add: brief description of your change"
+
+---
+
+## Step 7: Push Your Branch
+
+git push origin feature/your-feature-name
+
+---
+
+## Step 8: Raise a Pull Request
+
+1. Go to the original repo on GitHub
+2. Click New Pull Request
+3. Select your branch
+4. Fill in the PR description properly
+
+---
+
+## PR Description Rules (Very Important!)
+
+Your PR will be automatically checked by Prashant's PR Checker Bot.
+The bot will reject your PR if:
+
+- You have not linked an issue
+- Your description is too short
+
+Always write like this in your PR description:
+
+Fixes #ISSUE_NUMBER
+
+Brief description of what you changed and why.
+
+Example:
+
+Fixes #2
+
+Added search functionality to filter students by course name.
+The search bar on dashboard now filters results in real time without page reload.
+
+---
+
+## Step 9: Wait for Review
+
+Once your PR passes the bot check it will get the ready-for-review label.
+Then wait for Prashant to review and merge your PR.
+
+---
+
+## Need Help?
+
+Open a new issue and describe your problem clearly.
+Label it as question or help wanted.