Add missing import (#977)

* Add missing import

In a newly created Django project (version 3.2.1) the `include` function is not imported.

* Register myself as an author

Co-authored-by: Asif Saif Uddin <auvipy@gmail.com>

Author: Michael Howitz

AUTHORS

@@ -40,6 +40,7 @@ Jonathan Steffan
 Jozef Knaperek
 Jun Zhou
 Kristian Rune Larsen
+Michael Howitz
 Paul Dekkers
 Paul Oswald
 Pavel Tvrdík

docs/tutorial/tutorial_01.rst

@@ -33,6 +33,8 @@ Include the Django OAuth Toolkit urls in your `urls.py`, choosing the urlspace y
 
 .. code-block:: python
 
+    from django.urls import path, include
+
     urlpatterns = [
         path("admin", admin.site.urls),
         path("o/", include('oauth2_provider.urls', namespace='oauth2_provider')),