docs: add plugin setup guide

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

@@ -0,0 +1,15 @@
+#pragma once
+
+namespace RE
+{
+	template <class T, T N, class D>
+	class hkHandle
+	{
+	public:
+		~hkHandle() noexcept {}  // intentional
+
+		// members
+		T m_value;  // 0x00
+	};
+	static_assert(sizeof(hkHandle<std::uint8_t, 255, void>) == 0x01);
+}