docs: Update DEVELOPMENT.md and add CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to AWS MCP Proxy
+
+Thank you for your interest in contributing to the AWS MCP Proxy Server! We welcome contributions from the community.
+
+## Quick Start
+
+1. **Fork the repository** on GitHub
+2. **Set up your development environment** - see [DEVELOPMENT.md](DEVELOPMENT.md) for detailed setup instructions
+3. **Create a feature branch** from `main`
+4. **Make your changes** following our coding standards
+5. **Run tests and quality checks** to ensure everything works
+6. **Submit a pull request** with a clear description
+
+For detailed technical information, development workflow, and troubleshooting, see [DEVELOPMENT.md](DEVELOPMENT.md).
+
+## Ways to Contribute
+
+### 🐛 Reporting Bugs
+- Use GitHub Issues to report bugs
+- Include steps to reproduce, expected vs actual behavior
+- Provide AWS region, Python version, and relevant logs
+- Check existing issues to avoid duplicates
+
+### 💡 Suggesting Features
+- Open a GitHub Issue with the "enhancement" label
+- Describe the use case and expected behavior
+- Consider MCP specification compatibility
+- Discuss design before implementing large changes
+
+### 🔧 Code Contributions
+- Follow the development workflow in [DEVELOPMENT.md](DEVELOPMENT.md)
+- Ensure tests pass: `uv run pytest --cov`
+- Follow code quality standards: `uv run pre-commit run --all-files`
+- Use conventional commit messages (enforced by pre-commit hooks)
+
+### 📚 Documentation
+- Improve README.md, DEVELOPMENT.md, or code documentation
+- Add examples or clarify existing instructions
+- Fix typos or broken links
+
+## Code of Conduct
+
+- **Be respectful and inclusive** in all interactions
+- **Focus on constructive feedback** during code reviews
+- **Help others learn** - explain reasoning behind suggestions
+- **Follow professional standards** appropriate for AWS projects
+
+## Pull Request Guidelines
+
+### Before Submitting
+- [ ] Read [DEVELOPMENT.md](DEVELOPMENT.md) and set up your environment
+- [ ] Create tests for new functionality
+- [ ] Ensure all tests pass locally
+- [ ] Run code quality tools (`ruff`, `pyright`, `pre-commit`)
+- [ ] Update documentation if needed
+
+### PR Description Should Include
+- **What**: Brief description of changes
+- **Why**: Reason for the change (issue reference, use case)
+- **How**: Technical approach if complex
+- **Testing**: How you verified the changes work
+
+### Example PR Title
+```
+feat(auth): add support for custom SigV4 signing profiles
+```
+
+## Development Standards
+
+- **Python**: 3.10+ with type hints
+- **Code Style**: Follow `ruff` configuration (99 char line limit)
+- **Testing**: Maintain 80%+ test coverage
+- **Commits**: Use [Conventional Commits](https://www.conventionalcommits.org/) format
+- **Documentation**: Update relevant docs with changes
+
+## Getting Help
+
+- **Technical Issues**: See troubleshooting in [DEVELOPMENT.md](DEVELOPMENT.md)
+- **Questions**: Open a GitHub Discussion or Issue
+- **MCP Specification**: Refer to [Model Context Protocol](https://spec.modelcontextprotocol.io/)
+
+## License
+
+By contributing, you agree that your contributions will be licensed under the Apache 2.0 License that covers this project.
+
+---
+
+**New to the project?** Start with [DEVELOPMENT.md](DEVELOPMENT.md) for complete setup and development instructions.