update rate

lib/model/shipment_rate_model.dart

@@ -1,6 +1,8 @@
 import 'dart:async';
 
 import 'package:cloud_firestore/cloud_firestore.dart';
+import 'package:fcs/vo/custom.dart';
+import 'package:fcs/vo/discount.dart';
 import 'package:fcs/vo/rate.dart';
 import 'package:logging/logging.dart';
 
@@ -22,7 +24,17 @@ class ShipmentRateModel extends BaseModel {
         price: 8),
   ];
 
-  int freeDeliveryWeight=10;
+  List<Custom> customs = [
+    Custom(productType: 'Phone', fee: 40),
+    Custom(productType: 'Max Book', fee: 40)
+  ];
+
+  List<Discount> discountsByWeight = [
+    Discount(weight: 10, discountRate: 3),
+    Discount(weight: 20, discountRate: 5)
+  ];
+
+  int freeDeliveryWeight = 10;
 
   void initUser(user) {
     super.initUser(user);