chore: add AdminSiteOTPRequired example

Author: dopry

example/urls.py

@@ -5,6 +5,7 @@
 
 from two_factor.gateways.twilio.urls import urlpatterns as tf_twilio_urls
 from two_factor.urls import urlpatterns as tf_urls
+from two_factor.admin import AdminSiteOTPRequired
 
 from .views import (
     ExampleSecretView, HomeView, RegistrationCompleteView, RegistrationView,
@@ -40,6 +41,7 @@
     path('', include(tf_twilio_urls)),
     path('', include('user_sessions.urls', 'user_sessions')),
     path('admin/', admin.site.urls),
+    path('otp_admin/', AdminSiteOTPRequired().urls),
 ]
 
 if settings.DEBUG: