docs: add plugin setup guide

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

@@ -0,0 +1,19 @@
+#pragma once
+
+#include "RE/H/hkHandle.h"
+
+namespace RE
+{
+	class hknpBodyIdBaseDiscriminant
+	{
+	public:
+	};
+	static_assert(std::is_empty_v<hknpBodyIdBaseDiscriminant>);
+
+	class hknpBodyId :
+		public hkHandle<std::uint32_t, 2147483647, hknpBodyIdBaseDiscriminant>
+	{
+	public:
+	};
+	static_assert(sizeof(hknpBodyId) == 0x04);
+}