docs: add plugin setup guide

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

@@ -0,0 +1,53 @@
+#pragma once
+
+namespace RE
+{
+	class hkStringPtr
+	{
+	public:
+		using size_type = std::int32_t;
+
+		hkStringPtr() = default;
+
+		hkStringPtr(const char* a_data)
+		{
+			using func_t = std::add_pointer_t<void(hkStringPtr*, const char*)>;
+			static REL::Relocation<func_t> func{ ID::hkStringPtr::ctor };
+			func(this, a_data);
+		}
+
+		const char* data() const noexcept
+		{
+			return reinterpret_cast<const char*>(reinterpret_cast<std::uintptr_t>(m_data) & ~kManaged);
+		}
+
+		const char* c_str() const noexcept
+		{
+			return data();
+		}
+
+		bool empty() const noexcept
+		{
+			return !m_data || m_data[0] == '\0';
+		}
+
+		size_type size() const
+		{
+			return static_cast<size_type>(std::strlen(data()));
+		}
+
+		size_type length() const
+		{
+			return size();
+		}
+
+	protected:
+		enum : std::int32_t
+		{
+			kManaged = 1 << 0
+		};
+
+		const char* m_data{ nullptr };  // 0
+	};
+	static_assert(sizeof(hkStringPtr) == 0x8);
+}