title: TargetFrameworkVersion with Xamarin
body: <p>This may sound like a stupid question (yes :) ) , but I'm learning.</p>
  
  <p>I would like to create an application in Visual Community/Xamarin to display a simple hello. The technical constraint is that I'd like to develop it to test it on an Android 4.4
  Everything is installed correctly, the emulator works but when I want to launch the application (F5), I get the following message :</p>
  
  <blockquote>
    <p>Gravité   Code    Description Projet  Fichier Ligne   État de la suppression
    Erreur        The $(TargetFrameworkVersion) for Hi.Android (v4.4) is less
    than the minimum required $(TargetFrameworkVersion) for Xamarin.Forms
    (8.1). You need to increase the $(TargetFrameworkVersion) for
    Hi.Android.   Hi.Android</p>
  </blockquote>
  
  <p>The project is set as follow :</p>
  
  <ul>
  <li>Compile with : Android 4.4</li>
  <li>Minimal Android Version : 4.4</li>
  <li>Targetted Android : 4.4</li>
  <li>Xamarin.Forms (4.6.0.800)</li>
  <li>Xamarin.Essentials (1.5.3.2)</li>
  </ul>
  
  <p>Any idea?</p>