Added concept for roles

[ZombieAlienRobot]

Added some ideas for user roles with short descriptions of what their permissions are.

[SkyDiverStar]

I post my idea, as a comment as well.

• Standard User: Has all the rights to access courses he is enrolled in, join courses he has the right to and work on his own progress in those courses. He can't change anything, unless it is his password, Username or other personal information. (Example: Student)
• Worker: Those people have all the rights Standard Users have + the right to edit course data for courses they were allowed to. Without the rights given by an admin or an owner, they can not change anything in a course they should not be able to. (Example: Tutoren)
• Owner: Theis group of people have the right to create their own courses and edit them, as well as give chosen users the ability to edit the courses in ceratin ways. They can not edit/change courses, they have not created themselves or were given the right to. (Example: Lecturer)
• Admin: Have full access to the site, including sesitive and destructive actions like managing security or deleting a course. They are the ones that give/create owner-class users.

[ZombieAlienRobot]

I don't like Worker as a role name, something like Content Creator is probably more fitting. User is maybe too generic, but it's fine.

[SkyDiverStar]

I didn't like the term Worker myself, but that was the most generic term I could come up with. But I like Content Creator or Moderator (just popped in my mind). I tried to leave it as a generic as possible, but at one retro (I believe) we had the discussion, that it should be generic or less university/school related.