add FCS UI

lib/pages/processing/model/processing_model.dart

@@ -0,0 +1,37 @@
+import 'dart:async';
+import 'dart:io';
+
+import 'package:cloud_firestore/cloud_firestore.dart';
+import 'package:fcs/domain/entities/package.dart';
+import 'package:fcs/domain/entities/processing.dart';
+import 'package:fcs/pages/main/model/base_model.dart';
+import 'package:logging/logging.dart';
+
+class ProcessingModel extends BaseModel {
+  List<Processing> processings = [];
+  final log = Logger('ProcessingModel');
+
+  StreamSubscription<QuerySnapshot> listener;
+
+  void initUser(user) {
+    super.initUser(user);
+  }
+
+  @override
+  logout() async {
+    if (listener != null) await listener.cancel();
+
+    processings = [];
+  }
+
+  Future<void> createProcessing(Processing carton) {}
+
+  Future<void> updateProcessing(Processing carton) {}
+
+  Future<void> createPackage(Package package, List<File> files) {}
+
+  Future<void> updatePackage(
+      Package package, List<File> files, List<String> deletedUrls) {}
+
+  Future<void> deletePackage(String id) {}
+}