Add CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+Thank you for your interest in contributing to the MCP Python SDK! This document provides guidelines and instructions for contributing.
+
+## Development Setup
+
+1. Make sure you have Python 3.10+ installed
+2. Install [uv](https://docs.astral.sh/uv/getting-started/installation/)
+3. Clone the repository:
+```bash
+git clone https://github.com/modelcontextprotocol/python-sdk.git
+cd python-sdk
+```
+4. Install dependencies:
+```bash
+uv sync --frozen --all-extras --dev
+```
+
+## Development Workflow
+
+1. Create a new branch for your changes
+2. Make your changes
+3. Ensure tests pass:
+```bash 
+uv run pytest
+```
+4. Run type checking:
+```bash
+uv run pyright
+```
+5. Run linting:
+```bash
+uv run ruff check .
+uv run ruff format .
+```
+6. Submit a pull request
+
+## Code Style
+
+- We use `ruff` for linting and formatting
+- Follow PEP 8 style guidelines
+- Add type hints to all functions
+- Include docstrings for public APIs
+
+## Pull Request Process
+
+1. Update documentation as needed
+2. Add tests for new functionality
+3. Ensure CI passes
+4. Maintainers will review your code
+5. Address review feedback
+
+## Code of Conduct
+
+Please note that this project is released with a [Code of Conduct](CODE_OF_CONDUCT.md). By participating in this project you agree to abide by its terms.
+
+## License
+
+By contributing, you agree that your contributions will be licensed under the MIT License.