docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/W/WORLD_LOCATION.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include "RE/N/NiPoint3.h"
+
+namespace RE
+{
+	class TESForm;
+
+	class WORLD_LOCATION
+	{
+	public:
+		// members
+		TESForm* locationForm;  // 00
+		NiPoint3 locPt;         // 08
+		float    zRot;          // 14
+	};
+	static_assert(sizeof(WORLD_LOCATION) == 0x18);
+}