Adds a first version of the wiki documentation

Contains:

• CLI user doc
• Assignment creation tutorial
• How to perform exercise tutorial

Wiki/UserDocumentation/1-Authentification.md

+# Authentication to the Dojo
+
+The authentication is done in two steps: login into the dojo app and into https://gitedu.hesge.ch (through an API token).
+
+1.  Login into the dojo application:
+```bash
+dojo session application login --user <email>
+```
+```console
+? Please enter your password [hidden]
+Please wait while we are logging in you to Dojo...
+✔ Logged in
+    ✔ Teaching staff permissions
+    ✔ Student permissions
+```
+
+2. Register the API token (see below) for Gitlab
+```bash
+dojo session gitlab login <token>
+```
+```console
+Please wait while we are testing your Gitlab token...
+ℹ Checking Gitlab token: 
+    ✔ Read access
+    ✔ Write access
+```
+The API token can be created by (see <https://docs.gitlab.com/ee/user/profile/personal_access_tokens.html> for more informations):
+
+- Logging into <https://gitedu.hesge.ch>
+- **Preferences -> Access Tokens**
+- Give a name to your token and a validity
+- Tick the **api** box
+- Click the **Create personal access token**
+
+3. Test if it is working
+```bash
+dojo session test
+```
+```console
+ℹ Checking Dojo session: 
+    ✔ The session is valid
+        ✔ Teaching staff permissions
+        ✔ Student permissions
+ℹ Checking Gitlab token: 
+    ✔ Read access
+    ✔ Write access
+```
+
+Good news. You can use the Dojo!