title: ModelBuilder' does not contain a definition for 'ApplyAllConfigurations'?
body: <p>I am following <a href="https://www.youtube.com/watch?v=_lwCVE_XgqI&amp;t=1396s" rel="nofollow noreferrer">this youtube</a> video and at time <a href="https://youtu.be/_lwCVE_XgqI?t=2048" rel="nofollow noreferrer">34:05</a>, It is architecure for ASP.Net core using EntityFramework Core and they are showing an extension method  </p>
  
  <pre><code>    modelBuilder.ApplyAllConfigurations();
  </code></pre>
  
  <p>I tried this in my code and it throws error: 
  <em>'ModelBuilder' does not contain a definition for 'ApplyAllConfigurations' and no accessible extension method 'ApplyAllConfigurations' accepting a first argument of type 'ModelBuilder' could be found (are you missing a using directive or an assembly reference?</em></p>
  
  <p>Am I missing any reference? If not, How can I implement this in my Project?</p>