Add script to generate docs (github#622)

Author: JoannaaKL

script/generate-docs

@@ -0,0 +1,5 @@
+#!/bin/bash
+
+# This script generates documentation for the GitHub MCP server.
+# It needs to be run after tool updates to ensure the latest changes are reflected in the documentation. 
+go run ./cmd/github-mcp-server generate-docs