Changed email to username
Changed email field to username, changed error message when field is not filled and removed validation of a field format.
Added documentation comments
Added documentation comments to the login screen and its layout
Added todos for login form events
To test the functionality, login form values are logged to the console when the form is submitted. That is dangerous, so I added todos that will remind us to delete these logs when authentication is implemented.
Streched login button
Login button now fills width of the form
Changed error messages
Changed error messages for required email and password and added check of email address format
Added layout of the login screen
Created a layout in a separate file and added it to the login screen
Added basic login form