title: Django Oscar. How to add product?
body: <p>I'm a beginner in Python and Django.
  I have installed django-oscar. Then I Configured it and started the server, it works.</p>
  
  <p>Now, I don't understand <code>how to add a product</code>?</p>
  
  <p>At the dashboard there is a button <code>Create new product</code>. But in order to add new product it asks to select product class and I can not find any product class in the given dropdown options.</p>
  
  <p>Provide me a demo example of how to add product in django-oscar.</p>