docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/L/LOADED_REF_DATA.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include "RE/B/BSModelDB.h"
+#include "RE/N/NiPointer.h"
+
+namespace RE
+{
+	class NiAVObject;
+
+	class LOADED_REF_DATA
+	{
+	public:
+		// members
+		BSModelDB::HandelListHead handleList;           // 00
+		NiPointer<NiAVObject>     data3D;               // 08
+		TESWaterForm*             currentWaterType;     // 10
+		float                     relevantWaterHeight;  // 18
+		float                     cachedRadius;         // 1C
+		std::uint16_t             flags;                // 20
+		std::int16_t              underwaterCount;      // 22
+	};
+	static_assert(sizeof(LOADED_REF_DATA) == 0x28);
+}