docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/S/SimpleAnimationGraphManagerHolder.h

@@ -0,0 +1,29 @@
+#pragma once
+
+#include "RE/B/BSTSmartPointer.h"
+#include "RE/I/IAnimationGraphManagerHolder.h"
+#include "RE/N/NiPointer.h"
+
+namespace RE
+{
+	class BSAnimationGraphManager;
+	class SimpleAnimationGraphManagerLoadingTask;
+
+	class __declspec(novtable) SimpleAnimationGraphManagerHolder :
+		public IAnimationGraphManagerHolder
+	{
+	public:
+		static constexpr auto RTTI{ RTTI::SimpleAnimationGraphManagerHolder };
+		static constexpr auto VTABLE{ VTABLE::SimpleAnimationGraphManagerHolder };
+
+		virtual ~SimpleAnimationGraphManagerHolder() = default;  // 00
+
+		// add
+		virtual void BackgroundTaskFinishedLoading() { return; }  // 01
+
+		// members
+		BSTSmartPointer<BSAnimationGraphManager>          animationGraphManager;  // 08
+		NiPointer<SimpleAnimationGraphManagerLoadingTask> loadingTask;            // 10
+	};
+	static_assert(sizeof(SimpleAnimationGraphManagerHolder) == 0x18);
+}