docs: add plugin setup guide

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

@@ -0,0 +1,19 @@
+#pragma once
+
+#include "RE/H/hkAabb.h"
+#include "RE/H/hkVector4.h"
+
+namespace RE
+{
+	class hkIntSpaceUtil
+	{
+	public:
+		// members
+		hkVector4f m_bitOffsetLow;   // 0x00
+		hkVector4f m_bitOffsetHigh;  // 0x10
+		hkVector4f m_bitScale;       // 0x20
+		hkVector4f m_bitScaleInv;    // 0x30
+		hkAabb     m_aabb;           // 0x40
+	};
+	static_assert(sizeof(hkIntSpaceUtil) == 0x60);
+}