docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/T/TESCellFullyLoadedEvent.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include "RE/B/BSTEvent.h"
+
+namespace RE
+{
+	class TESCellFullyLoadedEvent
+	{
+	public:
+		[[nodiscard]] static BSTEventSource<TESCellFullyLoadedEvent>* GetEventSource()
+		{
+			using func_t = decltype(&TESCellFullyLoadedEvent::GetEventSource);
+			static REL::Relocation<func_t> func{ ID::TESCellFullyLoadedEvent::GetEventSource };
+			return func();
+		}
+
+		// members
+		TESObjectCELL* cell;
+	};
+	static_assert(sizeof(TESCellFullyLoadedEvent) == 0x8);
+}