title: django-registration - new user to a specific group
body: <p>I'm using (and learning) Django on my newest product, and I just installed and started using <a href="https://bitbucket.org/ubernostrum/django-registration/" rel="nofollow noreferrer">django-registration</a> app to allow my users to auto-register themselves.</p>
  
  <p>Everything's working good, but I'm thinking about assigning every new user to a specific group (already created), so I can "separate" the admins from the normal users.</p>
  
  <p>How can I do this? The documentation about this app is awful, IMO.</p>
  
  <p>I didn't create any model or configuration to start using the django-registration app.</p>