Update README.md

Added Buy me a coffee. I like coffee

Author: arashiyama

README.md

@@ -12,6 +12,12 @@ This is a Model Context Protocol (MCP) server implementation for Google Calendar
 - Webhook notifications for calendar changes
 - Database persistence for tokens and webhooks
 
+## Support the Project
+
+If you find this project useful, consider supporting the developer:
+
+[Buy Me A Coffee](https://buymeacoffee.com/jonathancare)
+
 ## Setup Instructions
 
 1. Create a Google Cloud project and enable the Google Calendar API:
@@ -334,4 +340,4 @@ The server also supports event reminder notifications:
   ],
   "timestamp": "2023-01-15T08:45:00Z"
 }
-```
+```