title: Placeholder text alignment in Xamarin forms
body: <p>I don't know how to top the placeholder text in a entry box.
  I have a entry box that is very big and want to put the placeholder text in the top.</p>
  
  <pre><code>&lt;Entry Placeholder="Enter notes about the item" 
         Keyboard="Text" VerticalOptions="Start" HeightRequest="80" /&gt;
  </code></pre>