docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/H/hknpMaterialId.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include "RE/H/hkHandle.h"
+
+namespace RE
+{
+	class hknpMaterialIdBaseDiscriminant
+	{
+	public:
+	};
+	static_assert(std::is_empty_v<hknpMaterialIdBaseDiscriminant>);
+
+	class hknpMaterialId :
+		public hkHandle<std::uint16_t, 0xFFFF, hknpMaterialIdBaseDiscriminant>
+	{
+	public:
+	};
+	static_assert(sizeof(hknpMaterialId) == 0x02);
+}