title: Adding a user to a group in django
body: <p>How would I add a user to a group in django by the group's name?</p>
  
  <p>I can do this:</p>
  
  <pre><code>user.groups.add(1) # add by id
  </code></pre>
  
  <p>How would I do something like this:</p>
  
  <pre><code>user.groups.add(name='groupname') # add by name
  </code></pre>