Add a membership model that will belong to a `user` and a `chapter`, a user will then have many memberships same as a chapter. <img width="165" alt="Screenshot 2023-02-12 at 10 30 28" src="https://user-images.githubusercontent.com/686344/218298958-d7088244-dd12-4551-ac37-9c4cd39d603a.png">
Add a membership model that will belong to a
userand achapter, a user will then have many memberships same as a chapter.