docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/A/AnimationSystemUtils.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include "RE/B/BSFixedString.h"
+
+namespace RE
+{
+	namespace AnimationSystemUtils
+	{
+		inline bool WillEventChangeState(const TESObjectREFR& a_ref, const BSFixedString& a_evn)
+		{
+			using func_t = decltype(&WillEventChangeState);
+			static REL::Relocation<func_t> func{ ID::AnimationSystemUtils::WillEventChangeState };
+			return func(a_ref, a_evn);
+		}
+	}
+}