chore: Add CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to MCPB
+
+Thank you for your interest in contributing to MCPB! We welcome contributions from the community.
+
+## Getting Started
+
+1. Fork the repository
+2. Clone your fork: `git clone https://github.com/YOUR_USERNAME/mcpb.git`
+3. Install dependencies: `yarn`
+4. Build the project: `yarn build`
+5. Run tests: `yarn test`
+
+## Development Workflow
+
+1. Create a new branch for your feature or bugfix: `git checkout -b feature/your-feature-name`
+2. Make your changes
+3. Run linting: `yarn lint`
+4. Run tests to ensure everything passes: `yarn test`
+5. Commit your changes with a clear, descriptive commit message (all commits must be signed - see [Commit Signing](#commit-signing))
+6. Push to your fork and submit a pull request
+
+## Code Standards
+
+- **TypeScript**: All code should be written in TypeScript with proper type definitions
+- **Linting**: Run `yarn lint` before committing. Use `yarn fix` to auto-fix formatting issues
+- **Testing**: Add tests for new features and bug fixes
+- **Documentation**: Update relevant documentation (README.md, MANIFEST.md, etc.) when adding or changing functionality
+
+## Commit Signing
+
+**All commits must be signed.** This helps verify the authenticity of contributions.
+
+To set up commit signing, see [GitHub's documentation on commit signature verification](https://docs.github.com/en/authentication/managing-commit-signature-verification).
+
+## Pull Request Process
+
+1. Ensure your PR description clearly describes the problem and solution
+2. Reference any related issues in your PR description
+3. Make sure all tests pass and linting is clean
+4. Verify that all commits are signed
+5. Update documentation as needed
+6. Wait for review from maintainers
+
+## Types of Contributions
+
+### Bug Reports
+
+When filing a bug report, please include:
+- Clear description of the issue
+- Steps to reproduce
+- Expected vs actual behavior
+- Version information (`mcpb --version`)
+- Relevant logs or error messages
+
+### Feature Requests
+
+We welcome feature suggestions! Please:
+- Clearly describe the feature and use case
+- Explain why this would be valuable to users
+- Consider if it aligns with the project's goals
+
+### Code Contributions
+
+We especially welcome:
+- Bug fixes
+- Documentation improvements
+- Test coverage improvements
+- New features (please discuss in an issue first for large changes)
+
+## Testing
+
+- Write unit tests for new functionality
+- Ensure existing tests still pass
+- Test manually with real MCP bundles when applicable
+
+## Questions?
+
+Feel free to open an issue for questions about contributing or the project in general.
+
+## License
+
+By contributing to MCPB, you agree that your contributions will be licensed under the MIT License.