docs: add plugin setup guide

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

@@ -0,0 +1,18 @@
+#pragma once
+
+#include "RE/B/BSFixedString.h"
+#include "RE/B/BSTHashMap.h"
+
+namespace RE
+{
+	class BGSActionData;
+
+	class BGSAnimationSequencer
+	{
+	public:
+		// members
+		std::uint32_t                             numSequences;  // 00
+		BSTHashMap<BSFixedString, BGSActionData*> actions;       // 08
+	};
+	static_assert(sizeof(BGSAnimationSequencer) == 0x38);
+}