feat: add Claude Code plugin manifest

Add .claude-plugin/plugin.json to enable this MCP server as a Claude Code plugin.
This allows users to install and use chrome-devtools-mcp through Claude Code's
plugin system.

The plugin provides Chrome DevTools MCP server capabilities for browser automation,
debugging, and performance analysis directly from Claude Code.

Author: amondnet

.claude-plugin/plugin.json

@@ -0,0 +1,11 @@
+{
+  "name": "chrome-devtools-mcp",
+  "version": "latest",
+  "description": "Control and inspect a live Chrome browser through MCP - automate actions, debug, and analyze performance using Chrome DevTools",
+  "mcpServers": {
+    "chrome-devtools": {
+      "command": "npx",
+      "args": ["chrome-devtools-mcp@latest"]
+    }
+  }
+}