Finish loading the vscode examples v1; Improve on the infra: Add accessibility tree into the observation; Add activate window function, etc

desktop_env/server/README.md

@@ -71,3 +71,10 @@ You can use accerciser to check the accessibility tree on GNOME VM.
 ```sh
 sudo apt install accerciser
 ```
+
+
+### Additional Installation
+Activating the window manager control requires the installation of `wmctrl`:
+```bash
+sudo apt install wmctrl
+```