Do not expose public setters on Aggregate root

[humank]

When doing the order create instruction, there are whole bunch of setters running there.
try to use a business-intention method to wrap up the creation detail, such as
Order purchased = Order.create(DTO);
rather than --->
Order purchaseOrder = new Order();
purchaseOrder.setDrinkHere(orderDTO.isDrinkHere());
purchaseOrder.setItemName(orderDTO.getItemName());
purchaseOrder.setPrice(orderDTO.getPrice());
purchaseOrder.setQuantity(orderDTO.getQuantity());
purchaseOrder.setSeatNo(orderDTO.getSeatNo());

[humank]

closed by commit 203b2dc