title: Add a second attribute/category column to Django administrator GUI
body: <p>I'm learning Django right now and I made this class called Clowns. On the Django Admin page I made two test objects.</p>
  <p><a href="https://i.stack.imgur.com/Z69wv.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Z69wv.png" alt="objects" /></a></p>
  <p>I made four attributes(dunno what they're called lol) for clowns. They are title, description, identification, and hobbies. See below:</p>
  <pre><code>    title =             models.CharField(max_length=20)
      description =       models.TextField()
      identification =    models.CharField(default='-', max_length=5)
      hobbies=            models.TextField()
  </code></pre>
  <p>To make the &quot;CLOWN&quot; column you see in the image I added this to the clown class:</p>
  <pre><code>def __str__(self):
          return self.title
  </code></pre>
  <p>I seem to only be able to do this with one attribute/category, in this case it's title. How do I make another column for another attribute, say identification?</p>