Resource: https://developer.apple.com/documentation/usernotifications
Objective: Complete all the tasks to complete the Notification Manager.
Task 1: Instantiate Notification Manager (This is done for you.)
Task 2: Request authorization for notifications
Task 3: Create notification and send notification request
Task 4: Cancel Notifications
Task 5: Implement Time Interval Notification Trigger
Task 6: Implement Calendar Notification Trigger
Task 7: Implement Location Notification Trigger