docs: Add CI, npm version, and license badges to README

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: scalvert

README.md

@@ -1,5 +1,9 @@
 # docusaurus-plugin-mcp-server
 
+![CI Build](https://github.com/scalvert/docusaurus-plugin-mcp-server/actions/workflows/ci.yml/badge.svg)
+[![npm version](https://badge.fury.io/js/docusaurus-plugin-mcp-server.svg)](https://badge.fury.io/js/docusaurus-plugin-mcp-server)
+[![License](https://img.shields.io/npm/l/docusaurus-plugin-mcp-server.svg)](https://github.com/scalvert/docusaurus-plugin-mcp-server/blob/main/LICENSE)
+
 A Docusaurus plugin that exposes an [MCP (Model Context Protocol)](https://modelcontextprotocol.io/) server endpoint, allowing AI agents like Claude, Cursor, and other MCP-compatible tools to search and retrieve your documentation.
 
 ## Installation