docs: codex cli add way

Author: kingsword09

README.md

@@ -104,7 +104,11 @@ Go to `Cursor Settings` -> `MCP` -> `New MCP Server`. Use the config provided ab
 <details>
   <summary>Codex</summary>
   Follow the <a href="https://github.com/openai/codex/blob/main/docs/advanced.md#model-context-protocol-mcp">configure MCP guide</a>
-  using the standard config from above.
+  using the standard config from above. You can also install the Chrome DevTools MCP server using the Codex CLI:
+
+  ```bash
+  codex mcp add chrome-devtools -- npx chrome-devtools-mcp@latest
+  ```
 </details>
 
 ### Your first prompt