Started on UE4 server, semi working handshake

src/Prospect.Unreal/Exceptions/UnrealException.cs

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+using System.Runtime.Serialization;
+
+namespace Prospect.Unreal.Exceptions;
+
+public class UnrealException : Exception
+{
+    public UnrealException()
+    {
+    }
+
+    protected UnrealException(SerializationInfo info, StreamingContext context) : base(info, context)
+    {
+    }
+
+    public UnrealException(string? message) : base(message)
+    {
+    }
+
+    public UnrealException(string? message, Exception? innerException) : base(message, innerException)
+    {
+    }
+}

src/Prospect.Unreal/Exceptions/UnrealSerializationException.cs

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+using System.Runtime.Serialization;
+
+namespace Prospect.Unreal.Exceptions;
+
+public class UnrealSerializationException : UnrealException
+{
+    public UnrealSerializationException()
+    {
+    }
+
+    protected UnrealSerializationException(SerializationInfo info, StreamingContext context) : base(info, context)
+    {
+    }
+
+    public UnrealSerializationException(string? message) : base(message)
+    {
+    }
+
+    public UnrealSerializationException(string? message, Exception? innerException) : base(message, innerException)
+    {
+    }
+}