teacher view / user management: Scan Code

[eidueidu]

Besides the user management (user accounts with login) we need some way for teachers to run "their" experiment with "their own students".
What do you think of providing a functionality for teachers (if they are logged in) in Play -> "Invite to your Game" and then they get a view like the multi-player view with a QR-Code and an overview of their children (who logged in and where they are).

The data of students having played the game with your QR-Code is listed in your "Evaluate" data afterwards.