add shipment

lib/domain/constants.dart

@@ -48,3 +48,9 @@ const privilege_delivery = "deli";
 const privilege_invoice = "inv";
 const privilege_processing = "pr";
 const privilege_receiving = "rc";
+
+// Pickup types
+const shipment_local_pickup = "Local Pickup";
+const shipment_courier_pickup = "Courier Pickup";
+const shipment_local_dropoff = "Local Drop-off";
+const shipment_courier_dropoff = "Courier Drop-off";