docs: add plugin setup guide

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

@@ -0,0 +1,82 @@
+#pragma once
+
+#include "RE/H/hkReferencedObject.h"
+
+namespace RE
+{
+	template <class T>
+	class hkRefPtr
+	{
+	public:
+		hkRefPtr() = default;
+
+		hkRefPtr(std::nullptr_t) noexcept {};
+
+		hkRefPtr(T* a_ptr) :
+			m_ptr(a_ptr)
+		{
+			TryAddReference();
+		}
+
+		hkRefPtr(const hkRefPtr& a_other) :
+			m_ptr(a_other.m_ptr)
+		{
+			TryAddReference();
+		}
+
+		~hkRefPtr() noexcept
+		{
+			TryRemoveReference();
+		}
+
+		hkRefPtr& operator=(T* a_ptr)
+		{
+			if (m_ptr != a_ptr) {
+				TryRemoveReference();
+				m_ptr = a_ptr;
+				TryAddReference();
+			}
+
+			return *this;
+		}
+
+	public:
+		T* get() const noexcept { return m_ptr; }
+
+	public:
+		T& operator*() const noexcept
+		{
+			assert(static_cast<bool>(*this));
+			return *m_ptr;
+		}
+
+		T* operator->() const noexcept
+		{
+			assert(static_cast<bool>(*this));
+			return m_ptr;
+		}
+
+		explicit operator bool() const noexcept
+		{
+			return m_ptr != nullptr;
+		}
+
+	private:
+		void TryAddReference()
+		{
+			if (m_ptr)
+				reinterpret_cast<hkReferencedObject*>(m_ptr)->AddReference();
+		}
+
+		void TryRemoveReference()
+		{
+			if (m_ptr) {
+				reinterpret_cast<hkReferencedObject*>(m_ptr)->RemoveReference();
+				m_ptr = nullptr;
+			}
+		}
+
+	private:
+		T* m_ptr{ nullptr };
+	};
+}