login screen UI

[naveennvrgup]

Is your feature request related to a problem? Please describe.
In the current scenario, the first screen that the user will see when the app is opened is "login screen"

Describe the solution you'd like

1. This had to attempted only after Project structure #17 is solved.
2. create login screen UI - email, password and login button (for now its enough)
3. Make it as the first screen to be rendered when the app is opened.