[hw-3] loms service

docs/homework-3/img/loms-order-cancel.plantuml

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+@startuml
+
+actor User as u
+collections LOMS as l
+database OrdersStorage as os
+database StocksStorage as ss
+
+u -> l : gRPC Loms.OrderCancel\n\t- orderID
+activate l
+
+l -> os : order.GetByOrderID()
+l -> ss : stocks.ReserveCancel()
+l -> os : order.SetStatus(cancelled)
+deactivate l
+
+l -> u : Response: OK (code_id=0)
+
+@enduml