addedn the conentents for all messages regarding the BPMN diagramm and own interpretation.
also created an identifier for pieces to be used for network communication between server and client so that they talk about the same piece.
- a client state machine consits out of a 'ClientState' (every state of the machine) and a 'ClientStateMachine' (every state, which consists out of states), the machine starts with the ClientAutomaton
- analog for server
- started to implement logic for the server, transition from 'Lobby' to 'GameState'
