Build a simple timer application with kotlin

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.