Add documentation and source

Added documentation, source and extra files.

source/advanced/various/__init__.py

@@ -0,0 +1,9 @@
+from django.apps import AppConfig
+
+
+class VariousConfig(AppConfig):
+    default_auto_field = "django.db.models.BigAutoField"
+    name = "various"
+
+
+default_app_config = "various.VariousConfig"