Set up sbt build
Initial state
Add API
Add Player responding to Game.Started with Game.GestureShown
Add ClientApp creating two Players and sending Game.Lost/Won messages to them
Add PlayerSpec with test for responding to Game.Started with Game.GestureShown
Make Player send IckAckOck.Register when being created
Make Player fail if it doesn't receive IckAckOck.Registered within registerTimeout
Add Client supervising Player
Add IckAckOckProxy using ClusterClient