docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/N/NiNPShortPoint3.h

@@ -0,0 +1,14 @@
+#pragma once
+
+namespace RE
+{
+	class NiNPShortPoint3
+	{
+	public:
+		// members
+		std::int16_t x;  // 0
+		std::int16_t y;  // 2
+		std::int16_t z;  // 4
+	};
+	static_assert(sizeof(NiNPShortPoint3) == 0x6);
+}