Add X (Twitter) MCP server (#332)

Added enhanced X/Twitter MCP server with OAuth 2.0 support, v2 API media uploads, and comprehensive features for tweet management.

README.md

@@ -413,6 +413,7 @@ A growing set of community-developed and maintained servers demonstrates various
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+- **[X (Twitter)](https://github.com/mbelinky/x-mcp-server)** - Enhanced MCP server for Twitter/X with OAuth 2.0 support, v2 API media uploads, smart v1.1 fallbacks, and comprehensive rate limiting. Post tweets with text/media, search, and delete tweets programmatically.
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