Add Basecamp MCP Server – Project management integration (#412)

* Add Basecamp MCP Server to community servers

- Integration with Basecamp project management platform
- Supports managing projects, to-dos, card tables, documents, and team collaboration
- GitHub: https://github.com/georgeantonopoulos/MCP_servers/tree/main/Basecamp

* Fix Basecamp MCP Server GitHub link

Corrected link from incorrect path to proper repository:
https://github.com/georgeantonopoulos/Basecamp-MCP-Server

README.md

@@ -288,6 +288,7 @@ A growing set of community-developed and maintained servers demonstrates various
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+- **[Basecamp](https://github.com/georgeantonopoulos/Basecamp-MCP-Server)** - Integration with Basecamp project management platform for managing projects, to-dos, card tables, documents, and team collaboration
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