Update info for running unit tests

README said to use the default django command, but that does not work
with the current setup. The file has been updated to run pytest and a
pytest.ini file with the basic info needed to run the tests is now
included.

README.md

@@ -44,7 +44,9 @@ Refer to [drf-spectacular](https://github.com/tfranzel/drf-spectacular/) for det
 
 ## Testing
 
-    python manage.py test
+Use pytest with the pytest-django library to run unit tests.
+
+    pytest
 
 ## Static type analysis
 

pytest.ini

+[pytest]
+DJANGO_SETTINGS_MODULE = gregsite.settings.dev