Create a simple timer widget

This project should be done using flutter framework. The design of the widget is in attachments. It has following components, 1 - Elapsed Time (Time that has passed) 2 - Remaining Time 3 - Timer Completion percentage 4 - Total Time 5 - Start/Stop button The Total Time should be modifiable in the code. The timer should run even if I close the app or turn off the phone. Exactly after the total time is passed, the timer should stop and print a "Finish" msg in the console.