Things that are being stored in the database:
* Activity_data - Results of the activities
For every activity we store:
- User name
- Activity name
- Date
- Data
* Users- Users created by Teachers
For every User we store:
- Name : name of the user
- Avatar : user's image
* Groups - Groups created by Teachers
For every Group we store:
- Name: group's name
- Description: A brief description explaining what this group is about
* Users-Groups - To keep track of which users belong to which groups
For every Users-Group we store:
- User name: name of the user
- Group name: name of the group to which the user belong to