docs: add plugin setup guide

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

@@ -0,0 +1,22 @@
+#pragma once
+
+#include "RE/H/hkRotation.h"
+
+namespace RE
+{
+	class hkTransformf
+	{
+	public:
+		constexpr hkTransformf() noexcept = default;
+
+		constexpr hkTransformf(const hkRotationf& a_rotation, const hkVector4f& a_translation) noexcept :
+			m_rotation(a_rotation), m_translation(a_translation)
+		{}
+
+		// members
+		hkRotationf m_rotation;
+		hkVector4f  m_translation;
+	};
+
+	using hkTransform = hkTransformf;
+}