first commit

NitroxServer/Serialization/World/VersionMismatchException.cs

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+using System;
+using System.Runtime.Serialization;
+
+namespace NitroxServer.Serialization.World
+{
+    [Serializable]
+    public class VersionMismatchException : Exception
+    {
+        public VersionMismatchException() { }
+
+        public VersionMismatchException(string message) : base(message) { }
+
+        public VersionMismatchException(string message, Exception inner) : base(message, inner) { }
+
+        public override string ToString()
+        {
+            return base.Message;
+        }
+    }
+}