Email verification

The capability to check whether the email is verified or not is added.
Some code changes were also done to avoid errors and improve stability.

Added the ability to check whether the user is email verified or not.

The status can be seen from the debug console in Visual Studio Code while the app is running.

Added login and register view

The previous connection fail issue was from the pixel emulator, not from this program. The pixel emulator must be cold booted. In other words, it must be switched on from switched off state.
It is highly recommended to connect a cold booted emulator to vs code.

implemented simple signup method with firebase

⚠⚠⚠Sometimes the connection fails