docs: add plugin setup guide

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

@@ -0,0 +1,17 @@
+#pragma once
+
+#include "RE/B/BGSLocalizedString.h"
+#include "RE/T/TESTexture.h"
+
+namespace RE
+{
+	class RANK_DATA
+	{
+	public:
+		// members
+		BGSLocalizedString maleRankTitle;    // 00
+		BGSLocalizedString femaleRankTitle;  // 08
+		TESTexture         textureInsignia;  // 10
+	};
+	static_assert(sizeof(RANK_DATA) == 0x20);
+}