use dry principle possible and added example project

example/example_project/urls.py

@@ -0,0 +1,8 @@
+from django.contrib import admin
+from django.urls import include, path
+
+urlpatterns = [
+    path("admin/", admin.site.urls),
+    path("nepkit/", include("django_nepkit.urls")),
+    path("", include("demo.urls")),
+]