add warning

README.md

@@ -14,6 +14,8 @@ Edit the `~/.bashrc` file (e.g., `vim ~/.bashrc`).
 At the end of the file, add the content of this repository's `bashrc`.
 It defines environment variables for the path, libraries, and proxy.
 
+**Exit the terminal (using `exit`), and reopen a new terminal!**
+
 Launch the `install-vscode.sh` script using `bash`:
 ```shell
 bash install-vscode.sh