Add card table functionality to Basecamp client and MCP server CLI

- Implement methods for managing card tables and columns in BasecampClient.
- Add corresponding tools in MCP server CLI for card table operations.
- Update README with new card table tools and usage examples.
- Create example script demonstrating card table API usage.
- Add unit tests for card table functionality.

.gitignore

@@ -57,3 +57,5 @@ composio_client_example.py
 .composio/ 
 
 .env
+card_table_implementation.md
+card-tables-docs.md