docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/I/InventoryUserUIInterfaceEntry.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include "RE/B/BSTArray.h"
+#include "RE/I/InventoryInterface.h"
+
+namespace RE
+{
+	class InventoryUserUIInterfaceEntry
+	{
+	public:
+		// members
+		InventoryInterface::Handle     invHandle;   // 00
+		BSTSmallArray<std::uint8_t, 4> stackIndex;  // 08
+	};
+	static_assert(sizeof(InventoryUserUIInterfaceEntry) == 0x20);
+}