Add roles to members

[lislis]

There is no free registration on the app, members are invited by existing members. (Check if this is actually the case)

Every registered member can write blog posts and create events, as well as add Taetigkeiten and expenses once they are in.

The treasurer role can see all expenses and edit them.

The vorstand role can see all expenses but not edit them.

Question is, who is able to assign roles? I feel like only having the vorstand do this too restricting, but giving everyone the possibility is not restricting enough? Should there be an admin role for this?