Create a promodoro screen as 5th screen in swipeableScreen

[rohandakua]

A new feature is requested which is a promodoro screen.

It should have

1. setting time (focus time)
2. break time (break time)
3. a graph or a window that shows the details for the time spend in the focus time for the week.
4. a button to start the promodoro screen , when clicked it goes to a promodoro screen that starts a time down of focus time setted , and after it gets completed a time down of break time should start . it should repeat until the person goes back .