Added CRUD for notes

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Added mock tests

0.12.0

added mock tests

Fixed a typo

Changed 'Week password' to 'Weak password'

Email verification during log in

Implemented email verification during log in.

A proper navigation and registration process implemented

With this release, a proper navigation method among the widgets, and a proper registration system implemented.

Error widgets in login

If something goes wrong during the log in process, a widget will be shown to the user with the corresponding error message. For now, it is iimplemented in the login widget.

Replaced hard coded routes

the value of the routes are now kept in the constants folder.

Fixed login button

In the previous release, the login button didn't take the user to the home page after successfully log in. It has been fixed.

Log out

Added Log out button and mechanism.

login <-> register

In this update, it is possible to easily switch between register view and login view.
Also, the VerifyEmailView class has been moved to its own dart file.