Merge pull request #7 from Mardona-Team/Alaa_Scaffolding

Adding scaffolds for User Question Answer Membership classes
Add Quiz and Group models
Merge pull request #8 from Mardona-Team/Ali_Scaffolding

Add Quiz and Group models
Fixing Quiz Model
Update Relations in the Database
Merge pull request #9 from Mardona-Team/Ali_Scaffolding

Fixing Quiz Model
Adding relations to models
Merge branch 'master' into Alaa_Scaffolding
Adding the remaining relations to User Question Answer Membership