docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/R/REFR_LIGHT.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include "RE/N/NiPointer.h"
+
+namespace RE
+{
+	class BSLight;
+	class NiLight;
+
+	class REFR_LIGHT
+	{
+	public:
+		// members
+		NiPointer<NiLight> light;       // 00
+		NiPointer<BSLight> BSLight;     // 08
+		float              wantDimmer;  // 10
+	};
+	static_assert(sizeof(REFR_LIGHT) == 0x18);
+}