title: foreign key in django_models
body: <p>In pgAdmin I create my table :</p>
  
  <p><a href="https://i.stack.imgur.com/0XacH.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0XacH.png" alt="PgAdmin screenshot"></a></p>
  
  <p>in this table there are 2 columns by "foreign key" and connect to column of other table:</p>
  
  <p><a href="https://i.stack.imgur.com/mjTwC.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/mjTwC.png" alt="foreign key screenshot"></a></p>
  
  <p>how to can create this table in django models?
  "I use postgresql in django".</p>