add structure

lib/vo/attach.dart

@@ -0,0 +1,14 @@
+import 'dart:io';
+
+class AttachFile {
+  File orderFile;
+  File storageFile;
+  String action;
+
+  AttachFile({this.orderFile, this.storageFile});
+
+  @override
+  String toString() {
+    return 'AttachFile{orderFile:$orderFile, storageFile:$storageFile}';
+  }
+}