Better messaging and better rule implementation

Mau/GameState.cs

@@ -6,10 +6,11 @@ public class GameState
     public string MyState { get; set; }
     public List<string> Hand { get; set; } = new();
     public string CurrentCard { get; set; }
+    public string? NextAllowedCardType { get; set; }
     public PlayerDTO CurrentPlayer { get; set; }
     public List<PlayerDTO> Players { get; set; } = new();
 
-    public GameState(Player me, Card currentCard, Player currentPlayer, List<Player> others)
+    public GameState(Player me, Card currentCard, CardType? nextAllowedCardType, Player currentPlayer, List<Player> others)
     {
         Me = new PlayerDTO(me);
         MyState = me.State.ToString();
@@ -23,6 +24,7 @@ public class GameState
             Players.Add(new PlayerDTO(player));
         }
         
+        NextAllowedCardType = nextAllowedCardType?.ToString();
         CurrentCard = currentCard.ToString();
         CurrentPlayer = new PlayerDTO(currentPlayer);
     }