Create CONTRIBUTING.md

Author: jspahrsummers

CONTRIBUTING.md

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+# Contributing to MCP Documentation
+
+Thank you for your interest in contributing to the Model Context Protocol (MCP) documentation! This guide will help you get started with contributing.
+
+## Getting Started
+
+1. Install the required tools:
+    - Node.js
+    - Git
+    - [Mintlify CLI](https://www.npmjs.com/package/mintlify): `npm i -g mintlify`
+
+2. Fork and clone the repository
+3. Create a new branch for your changes
+4. Run `mintlify dev` to preview changes locally
+
+## Documentation Guidelines
+
+- Keep content clear, concise, and technically accurate
+- Follow the existing file structure and naming conventions
+- Include code examples where appropriate
+- Use proper MDX formatting and components
+- Test all links and code samples
+
+## Content Types
+
+You can contribute to:
+
+- Conceptual guides
+- API reference documentation
+- Tutorials and quickstarts
+- Best practices and examples
+- Troubleshooting guides
+
+## Pull Request Process
+
+1. Ensure your changes follow our documentation guidelines
+2. Update the relevant table of contents if needed
+3. Test your changes locally using `mintlify dev`
+4. Submit a pull request with a clear description of your changes
+5. Wait for review and address any feedback
+
+## Need Help?
+
+- Check existing documentation at [modelcontextprotocol.io](https://modelcontextprotocol.io)
+- [Open an issue](https://github.com/modelcontextprotocol/docs/issues) for bugs or concerns
+- Join our [community discussions](https://github.com/modelcontextprotocol/docs/discussions)
+
+## Code of Conduct
+
+Please note that this project follows our [Code of Conduct](CODE_OF_CONDUCT.md). By participating, you agree to uphold these guidelines.