public async Task AddPlayer(string userName, string connectionId)
{
var match = _service.AddPlayerInRoom(userName, connectionId);
if (match.PlayerBlack != null)
{
await Clients.Client(match.PlayerBlack.ConnectionId).SendAsync("AddPlayerReceived", match);
}
if (match.PlayerWhite != null)
{
await Clients.Client(match.PlayerWhite.ConnectionId).SendAsync("AddPlayerReceived", match);
}
}