Resolve issue from V1 : method to send to other players that a new player

• Add logic in message controllers (Server and Client to send the new User to all players and receive it)

src/main/java/client/network/MessageClientController.java

@@ -5,6 +5,7 @@ import main.java.client.network.messages.clientToServer.LoginUserToServerMessage
 import main.java.client.network.messages.clientToServer.NewGameToServerMessage;
 import main.java.common.message.MessageMeta;
 import main.java.server.network.messages.serverToClient.ChatMessageToClientMessage;
+import main.java.server.network.messages.serverToClient.NewUserAddedMessage;
 import main.java.server.network.messages.serverToClient.ServerStateOnConnectionMessage;
 
 import java.util.Optional;
@@ -82,6 +83,9 @@ public class MessageClientController {
                 this.comCore.getComToDataClient().receivePlayersnGames(serverStateMessage.getUsersConnected(),
                         serverStateMessage.getGamesOnline());
                 break;
+            case "NewUserAddedMessage":
+            	NewUserAddedMessage newUserMessage = (NewUserAddedMessage) message;
+            	this.comCore.getComToDataClient().addNewUser(newUserMessage.getUserToAdd());
         }
     }
 }