Add GitHub Projects MCP server to community servers list

[aronweiler]

Description

This PR adds the GitHub Projects MCP server to the community servers list in the README.

Server Details

• Server: GitHub Projects MCP
• Changes to: README.md (adding entry to community servers list)

Motivation and Context

GitHub Projects MCP provides comprehensive tools for interacting with GitHub Projects using GraphQL. It fills a gap in the current server offerings by enabling AI agents to manage GitHub Projects with full API coverage including items, fields, milestones, and custom GraphQL queries.

How Has This Been Tested?

• Server has been tested with Claude Code, VS Code, and Claude Desktop
• All functionality verified against GitHub's GraphQL API
• Pagination and error handling tested with large projects (1000+ items)
• Rate limiting and retry logic verified

Breaking Changes

None - this is a new server addition to the community list.

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Protocol Documentation
• My server follows the MCP security best practices
• I have updated the server's README with comprehensive documentation
• I have tested my server with an LLM client (Claude Code, VS Code, Claude Desktop)
• My changes follow the repository's style guidelines (alphabetical ordering)
• New and existing tests pass locally
• I have added appropriate error handling (rate limits, API errors, validation)
• I have documented environment variables and configuration options

Additional Context

• Repository: https://github.com/redducklabs/github-projects-mcp
• PyPI Package: https://pypi.org/project/github-projects-mcp/
• Features: Complete GitHub Projects API coverage, multiple transport modes (stdio/SSE/HTTP), robust error handling, type safety with Pydantic
• Security: Token-based auth via environment variables, input validation, sanitized error messages, GraphQL mutation blocking