/**

In this week 's project you'll be making a Pomodoro Clock!

A user can specify how many minutes the timer should be set, and with a click on the play button it starts counting down!If the user wants to pause the timer, they can do so by clicking the pause button.

If the timer is running, the user can 't change the session length anymore

Use at least 3 functions

Display minutes and seconds

If the timer finishes the timer should be replaced by the message: Time 's up!

*

*/