Create-Habits and supporting classes

[GTorchy]

Create habit classes as well as supporting classes needed for later functionality. Also, connect habits to UserProfile.

• Generate UML diagrams for habit classes
• Create .java classes
• Create tests for generated code

[GTorchy]

Created UML diagram for habit class and supporting classes.

See: https://github.com/CMPUT301F21T13/FungalFunhouse/blob/create-habits/Documentation/Media/Habit_Class_UML/Habit_Class_UML_V0.1.png

[GTorchy]

Java classes for habits have been added, I still need to implement habits into UserProfile and create tests for the habit classes.

[GTorchy]

Pull request for create-habits #17 has been made, close this issue and move it to complete when the pull request is merged.