docs: add plugin setup guide

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

@@ -0,0 +1,14 @@
+#pragma once
+
+#include "RE/N/NiPoint3.h"
+
+namespace RE
+{
+	class BSNavmeshVertex
+	{
+	public:
+		// members
+		NiPoint3 location;  // 0
+	};
+	static_assert(sizeof(BSNavmeshVertex) == 0xC);
+}