add: order model, order create api, order create serializer, order item model

core/apps/orders/urls.py

@@ -1,6 +1,7 @@
 from django.urls import path, include
 
+from core.apps.orders.views import order as order_views
 
 urlpatterns = [
-    
+    path('order/create/', order_views.OrderCreateApiView.as_view()),
 ]