docs: add Fronteir AI hosted deployment link (#4)

Author: ElishaKay

README.md

@@ -10,6 +10,10 @@ A generic, modular server for implementing the Model Context Protocol (MCP). Thi
 
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+## Hosted deployment
+
+A hosted deployment is available on [Fronteir AI](https://fronteir.ai/mcp/profullstack-mcp-server).
+
 ## Features
 
 - Modular architecture for easy extension