docs: add plugin setup guide

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

@@ -0,0 +1,15 @@
+#pragma once
+
+namespace RE
+{
+	class NPC_DATA
+	{
+	public:
+		// members
+		std::int16_t  autoCalcHealth;        // 0
+		std::int16_t  autoCalcActionPoints;  // 2
+		std::uint16_t farDistance;           // 4
+		std::int8_t   gearedUpWeapons;       // 6
+	};
+	static_assert(sizeof(NPC_DATA) == 0x8);
+}