Game seems to work

Room/Messages/JoinMessage.cs

@@ -0,0 +1,21 @@
+namespace MauMau_Server.Room.Messages;
+
+public class JoinMessage
+{
+    public Guid Id { get; set; }
+    public string ChatMessage { get; set; }
+    public string? Data { get; set; }
+    
+    public JoinMessage(Guid id, string chatMessage, string data)
+    {
+        Id = id;
+        ChatMessage = chatMessage;
+        Data = data;
+    }
+    
+    public JoinMessage(Guid id, string chatMessage)
+    {
+        Id = id;
+        ChatMessage = chatMessage;
+    }
+}