Implement interest areas for users

Please do work for this task in a branch named issue-9.

Implement the ability for users to specify interest areas.
After the first time that a user chooses their interest areas, they should also have the option to change it at a later time.
Create capability for users to be notified when a new club is created matching their interest area.
The notification system should adapt to changing interests.

clubmeetup / club-meetup-app