Added comments for the methods in IDonTask.
Changed Date to Calendar for date representation.
Added getType and TaskType to IDonTask.
Added constructors for DonTask.
Changed the 2 Dates in setStartDate and setEndDate to Calendar (missed in last commit).
Implemented all currently present methods in DonTask.
Removed unused Date import in IDonTask.
Removed Date import in DonTask.
Added equals method to DonTask to allow equality comparison of a DonTask with another IDonTask.
Applied auto-formatting to DonTask.

Added IDonStorage interface with only addTask and removeTask specified.
Added storage variable for DonLogic's use. The constructor takes in the IDonStorage object (might change later).
Added the IDonLogic interface for DonLogic to follow.
Added the 3 basic createTask methods in IDonLogic.
Added unfinished implementation of the createTask methods in DonLogic.