Update SCG presentation

2020/2020-03-30_basicGitTraining/slides/configuration.md

@@ -41,6 +41,12 @@ If you don’t have yet an SSH key, you have to generate one:
 $ ssh-keygen -t rsa # -b 4096
 ```
 
+If you set a password to your key (recommended), add it to the `ssh-agent`:
+```bash
+$ eval "$(ssh-agent -s)"
+$ ssh-add -K ~/.ssh/id_rsa
+```
+
 Then, add the SSH key to Github/Gitlab.
 
 <img src="slides/img/icon-live-demo.png" height="100px">
\ No newline at end of file