title: How to add Countdown Timer in UWP app with Background support?
body: <p>I want to make a countdown Timer of 30 minutes in UWP with background support.
  is there is anyway to do that, like this App:</p>
  
  <p><a href="https://i.stack.imgur.com/qqyPQ.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/qqyPQ.jpg" alt="enter image description here"></a></p>
  
  <p>Here is my app <strong>overview Image</strong>: 
  <a href="https://i.stack.imgur.com/flwl4.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/flwl4.png" alt="enter image description here"></a></p>
  
  <p>And I want to Enable Claim button when timer ends.</p>