first commit

NitroxClient/Communication/MultiplayerSession/ConnectionState/SessionReservationRejected.cs

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+using System;
+using NitroxClient.Communication.Abstract;
+
+namespace NitroxClient.Communication.MultiplayerSession.ConnectionState
+{
+    public class SessionReservationRejected : ConnectionNegotiatedState
+    {
+        public override MultiplayerSessionConnectionStage CurrentStage => MultiplayerSessionConnectionStage.SESSION_RESERVATION_REJECTED;
+
+        public override void JoinSession(IMultiplayerSessionConnectionContext sessionConnectionContext)
+        {
+            throw new InvalidOperationException("The session has rejected the reserveration request.");
+        }
+    }
+}