public async Task NewConnection(User user)
        {
            user = TicTacToe.AddUser(user.Username);
            await Clients.Caller.SendAsync("Registered", user);

            if (TicTacToe.Players.Length < 2)
            {
                TicTacToe.SetAsPlayer(user.UserId);
                int number = TicTacToe.Players.Length;
                //await Groups.AddToGroupAsync(Context.ConnectionId, "Players");
                await Clients.Caller.SendAsync("SetAsPlayer", number);
            }
            else
            {
                //await Groups.AddToGroupAsync(Context.ConnectionId, "Spectators");
                await Clients.Caller.SendAsync("NoMorePlayer", user.Username);
            }
        }