title: Error in build for Xamarin Android when adding Google Map
body: <p>I have an android xamarin project, and I only add Xamarin.GooglePlayServices.Maps nuget.</p>
  
  <p>my build has this error : </p>
  
  <blockquote>
    <p>error: package com.google.android.gms.maps does not exist
          com.google.android.gms.maps.OnMapReadyCallback</p>
  </blockquote>