Allow groups to automatically ask question to newcomers
- Alice presses the "Join" button of Group A (she doesn't belong to it)
- A dialog appear: "The group #groupA asks you: Why do you want to join this group? How do you plan to participate?". The dialog includes a Textfield where Alice can write her answer.
- The reply is sent to the group Admins, as the petition of Alice to join the group... and they can decide more informed.
Optional: let groups choose which questions to ask
Optional: facilitate that the admin(s) can contact Alice to request more info (in a wave message)