title: How to make Xamarin Forms text size depending on OS settings text size
body: <p>I would like to make it possible for users to make text size bigger in my App and thereby easier to see the texts.<br>
  I don't want to do this inside my App setting when both iOS and Android have this directly build inside the OS.</p>
  
  <p>On Android the Xamarin Forms Label, Entry, etc. text sizes adjust according to Android text size setting.
  But that is not the case, when I try the same App on iOS.</p>
  
  <p>How do I make this work on iOS?</p>
  
  <p>Examples would be great :-)</p>