docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/H/hkVtableClassRegistry.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include "RE/H/hkReferencedObject.h"
+
+namespace RE
+{
+	class hkVtableClassRegistry :
+		public hkReferencedObject
+	{
+	public:
+		inline static constexpr auto RTTI{ RTTI::hkVtableClassRegistry };
+		inline static constexpr auto VTABLE{ VTABLE::hkVtableClassRegistry };
+
+		inline static hkVtableClassRegistry* GetSingleton()
+		{
+			static REL::Relocation<hkVtableClassRegistry*> singleton{ ID::hkVtableClassRegistry::Singleton };
+			return singleton.get();
+		}
+	};
+}