add notification and send notification

config/settings/base.py

@@ -30,6 +30,7 @@ APPS = [
     'core.apps.orders',
     'core.apps.finance',
     'core.apps.counterparty',
+    'core.apps.notifications',
 ]
 
 PACKAGES = [

config/urls.py

@@ -35,6 +35,7 @@ urlpatterns = [
             path('orders/', include('core.apps.orders.urls')),
             path('finance/', include('core.apps.finance.urls')),
             path('counterparties/', include('core.apps.counterparty.urls')),
+            path('notifications/', include('core.apps.notifications.urls')),
         ]
     )),