add FCS UI

lib/pages/carton_size/model/carton_size_model.dart

@@ -0,0 +1,36 @@
+import 'dart:async';
+
+import 'package:cloud_firestore/cloud_firestore.dart';
+import 'package:fcs/domain/entities/carton_size.dart';
+import 'package:fcs/pages/main/model/base_model.dart';
+import 'package:logging/logging.dart';
+
+class CartonSizeModel extends BaseModel {
+  List<CartonSize> cartonSizes = [];
+  final log = Logger('CartonSizeModel');
+
+  StreamSubscription<QuerySnapshot> listener;
+
+  void initUser(user) {
+    super.initUser(user);
+    cartonSizes = [
+      CartonSize(
+          id: "1", name: "FCS Small Box", length: 16, width: 12, height: 12),
+      CartonSize(
+          id: "2", name: "FCS Medium Box", length: 22, width: 16, height: 15),
+      CartonSize(
+          id: "3", name: "FCS Large Box", length: 28, width: 15, height: 16)
+    ];
+  }
+
+  @override
+  logout() async {
+    if (listener != null) await listener.cancel();
+
+    cartonSizes = [];
+  }
+
+  Future<void> addCartonSize(CartonSize cartonSize) async {}
+
+  Future<void> deleteCartonSize(String id) async {}
+}