Setup user auth packets

MistoxServer/mPacket/ResevedPackets.cs

@@ -13,8 +13,11 @@ namespace Mistox.ResevedPackets {
 
     [mPacket]
     public class UserAuthPacket {
+        // Sent to the server
         public string UserName { get; set; } = "";
         public string ConnectionKey { get; set; } = "";
+        // Response from the server
+        public string ServerName { get; set; } = "";
         public int AuthSuccessful { get; set; } = 0;        // 0 is standard, -1 is auth failure, 1 is auth success
     }