docs: add plugin setup guide

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

@@ -0,0 +1,17 @@
+#pragma once
+
+namespace RE
+{
+	namespace BooksRead
+	{
+		class Event
+		{
+		public:
+			// members
+			const TESObjectBOOK* book;
+			bool                 advancedActorValue;
+			bool                 addedPerk;
+		};
+		static_assert(sizeof(Event) == 0x10);
+	}
+}