229 uml admin functionality

[MrGooss]

closes #230

What is it supposed to do Add the designs for the admin role and permissions.

How can we test your branch Read the wiki under backend -> role system and check the class diagram. Class diagram

What broweser have been checked

• [ ] Chrome
• [ ] Firefox
• [ ] Opera
• [ ] Edge
• [ ] Safari

[AjobK]

Please bundle these composition lines and then I'll approve

[MrGooss]

Extracted to a new branch 230-uml-admin-functionality due to unnecessary files being added.