created paths to map urls for each corresponding app

adrianlancedamalerio_music/adrianlancedamalerio_music/urls.py

+from django.contrib import admin
+from django.urls import include, path
+urlpatterns = [
+    path('homepage/', include('Homepage.urls', namespace='Homepage')),
+    path('about/', include('About.urls', namespace='About')),
+    path('contact/', include('Contact.urls', namespace='Contact')),
+    path('admin/', admin.site.urls),
+]