docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/D/DisplayItemModel.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include "RE/B/BaseLoadedInventoryModel.h"
+
+namespace RE
+{
+	class DisplayItemModel :
+		public BaseLoadedInventoryModel  // 00
+	{
+	public:
+		// members
+		float         itemRotation;  // 40
+		std::uint32_t uniqueIndex;   // 44
+		std::uint16_t column;        // 48
+		std::uint16_t index;         // 4A
+		std::uint16_t row;           // 4C
+	};
+	static_assert(sizeof(DisplayItemModel) == 0x50);
+}