title: How to extend django admin user model with new fields?
body: <p>I want to add more fields to django built in admin user model. How can I achieve it?</p>
  
  <p>Actually , There are three users on django server, student , teacher and parent. And by adding a 'role' field to user model, I can identify which type of user is log-ged in . So how can I extend the model field.</p>
  
  <p>I'm expecting to identify different role of users in login.</p>