3. Build a simple timer application which provides below features:
a. A simple UI contains:
i. A timer picker so that user is able to set time
ii. A button to start/pause timer
iii. A button to stop timer
iv. A circle to present the progress of timer (0% – 100%)
b. the timer must be able to run when the application is in background
c. The application should notify user with sound, vibration and simple dialog when time is over.
