feat(activities): Add read views for Activity

activities/urls.py

@@ -0,0 +1,16 @@
+from django.urls import path
+
+from . import views
+
+
+app_name = 'activities'
+
+urlpatterns = [
+    path('activities',
+         views.ActivityListView.as_view(),
+         name='activity.list'),
+
+    path('activities/<int:pk>',
+         views.ActivityDetailView.as_view(),
+         name='activity.detail'),
+]