docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/P/PerkRankData.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include "RE/M/MemoryManager.h"
+
+namespace RE
+{
+	class PerkRankData
+	{
+	public:
+		PerkRankData(BGSPerk* a_perk, std::int8_t a_rank) :
+			perk(a_perk), currentRank(a_rank)
+		{}
+
+		F4_HEAP_REDEFINE_NEW(PerkRankData);
+
+		// members
+		BGSPerk*    perk;         // 00
+		std::int8_t currentRank;  // 08
+	};
+	static_assert(sizeof(PerkRankData) == 0x10);
+}