docs: add plugin setup guide

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

@@ -0,0 +1,14 @@
+#pragma once
+
+#include "RE/N/NiPoint2.h"
+
+namespace RE
+{
+	class TESRegionPoint
+	{
+	public:
+		// members
+		NiPoint2 point;  // 00
+	};
+	static_assert(sizeof(TESRegionPoint) == 0x8);
+}