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

is available wasn't merged. It is with this commit.
- 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());
         }
     }
 }

src/main/java/server/network/MessageServerController.java

@@ -93,7 +93,11 @@ public class MessageServerController {
                 List<UserLight> usersConnected = comCore.getComToData().getListUsers();
                 ServerStateOnConnectionMessage msg = new ServerStateOnConnectionMessage(loginMessage.getUserToAdd(),
                         usersConnected, gamesOnline);
-                MessageServerController.getInstance().sendListsToNewUser(msg);
+                this.sendListsToNewUser(msg);
+                
+                //notify others of the fact a new user is available
+                NewUserAddedMessage userToAdd = new NewUserAddedMessage(loginMessage.getUserToAdd());
+                this.notifyNewUserAdded(userToAdd);
                 break;
 
             case "ChatMessageToServerMessage":