Wiki => Add tips to add exercise members at exercise creation

Wiki/UserDocumentation/1-Authentification.md

@@ -13,6 +13,7 @@ Please wait while we are logging in you to Dojo...
     ✔ Teaching staff permissions
     ✔ Student permissions
 ```
+
 2. Register the API token (see below) for Gitlab
 ```bash
 dojo session gitlab login <token>

Wiki/UserDocumentation/3-Exercise-creation.md

@@ -25,6 +25,7 @@ Please wait while we are creating the exercise...
     ℹ HTTP Repo: https://gitedu.hesge.ch/dojo/exercise/dojo-ex_unique_name_some-long-hash.git
     ℹ SSH Repo: ssh://git@ssh.hesge.ch:10572/dojo/exercise/dojo-ex_unique_name_some-long-hash.git
 ```
+**Tips**: You cas use the --members_username or --members_id options to add other students of the group to the exercise.
 2. Make changes and try solving the exercise.
 3. The complete tests can be run with the following command.
 ```bash