title: Register custom user model with admin auth
body: <p>In a Django project, I have a custom user model that adds one extra field:</p>
  
  <pre><code>class User(AbstractUser):
  
      company = models.ForeignKey(Company, null=True, blank=True)
  </code></pre>
  
  <p>This model is defined in my app, say <code>MyApp.models</code>.</p>
  
  <p>How can I get the new <code>User</code> model to show up under "Authentication and Authorization" as the original <code>django.contrib.auth</code> model? </p>
  
  <p><a href="https://i.stack.imgur.com/AZxiV.png" rel="noreferrer"><img src="https://i.stack.imgur.com/AZxiV.png" alt="enter image description here"></a></p>