BACKEND - Create Exercise model

[hansjhaland]

What

Create Exercise model. This involves creating models for Unit and Module as well.

Why

Enable storing information about exercises.

How

One Exercise is connected to one Unit, which in turn is connected to one Module.

1. Create Exercise model with:

• ID (PK)
• Name
• Description
• Unit ID (FK)

2. Create Unit model with:

• ID (PK)
• Name
• Description
• Module ID (FK)

3. Create Module model with:

• ID (PK)
• Name
• Description

Note: These will be connected to student User and Cohort in the future.