Update README.md to mention restart

Some users are unaware that they need to restart JupyterLab instance after the pip installation

Author: gogakoreli

README.md

@@ -13,12 +13,23 @@ for the frontend extension.
 
 ## Install
 
-To install the extension, execute:
+1. To install the extension, execute:
 
 ```bash
 pip install jupyter_drives
 ```
 
+2. Restart JupyterLab
+- Local JupyterLab - stop and run jupyter lab command again
+```bash
+jupyter lab
+```
+  
+- Sagemaker Studio JupyterLab - execute the following restart command
+```bash
+restart-jupyter-server
+```
+
 ## Configure Credentials
 
 To begin using the extension and gain access to your drives, you need to configure your user credentials generated by the provider (e.g.: `access_key`, `secret-access-key` and if applicable `session_token`).