docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/B/BGSRefAliasInstanceData.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include "RE/B/BSTArray.h"
+
+namespace RE
+{
+	class BGSRefAlias;
+
+	class BGSRefAliasInstanceData
+	{
+	public:
+		// members
+		TESQuest*              quest;              // 00
+		BGSRefAlias*           alias;              // 08
+		BSTArray<TESPackage*>* instancedPackages;  // 10
+	};
+	static_assert(sizeof(BGSRefAliasInstanceData) == 0x18);
+}