Sign up with CheckList with email and password.
Registrations was implemented by using Firebase
Authentication.

Once registered, you will sign in and be directed to
the main screen.

To add a CheckList press the + button and enter
a CheckList title and press the Add button. The
CheckList will be added to the Firebase RealTime
database.

Click the desire CheckList you want. Then add an
item/task by pressing the + button. Enter the
item/task name and press the Add button to add
the item/task into the Firebase RealTime Database.

When an items/tasks has been accomplished, you
can cross the items/tasks off your list by pressing
that item/task.

If you mistakenly added an item/task in the wrong
CheckList. You can delete that item/task and add
the item/task into the correct CheckList