Create User Documentation/Clear sessions

User-Documentation/Clear-sessions.md

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+Django stores its session token in the database. You need to clear them on a regular basis. This can be done by setting a crontab running the following command.
+
+```bash
+python3 manage.py clearsessions
+```
+
+Further informations can be found [here](https://docs.djangoproject.com/en/1.11/topics/http/sessions/#clearing-the-session-store).