docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/B/BoneData.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include "RE/N/NiMatrix3.h"
+#include "RE/N/NiPoint3.h"
+
+namespace RE
+{
+	class BoneData
+	{
+	public:
+		// members
+		NiMatrix3     localBoneRotation;             // 00
+		NiPoint3      worldBoneDir;                  // 30
+		std::uint32_t parentWorldBoneRotationIndex;  // 3C
+	};
+	static_assert(sizeof(BoneData) == 0x40);
+}