update readme

Author: isaacphi

README.md

@@ -9,6 +9,8 @@ This is an [MCP](https://modelcontextprotocol.io/introduction) server that runs
 
 ## Demo
 
+mcp-language-server helps MCP enabled clients navigate codebases more easily by giving them access semantic tool like get definition, references, etc.
+
 ![Demo](demo.gif)
 
 ## Setup