backup. before shop update

lib/models/order_status.dart

@@ -0,0 +1,10 @@
+
+enum OrderStatus {
+  WAIT_FOR_SUBMISSION,    // -1
+  WAIT_FOR_PAYMENT,       // 0
+  WAIT_FOR_APPROVAL,      // 1
+  WAIT_FOR_DELIVERY,      // 2
+  WAIT_FOR_ARRIVAL,       // 3
+  RECEIVED_CONFIRMATION,  // 4
+  DONE                    // 5
+}