docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/N/NiMemManager.h

@@ -0,0 +1,34 @@
+#pragma once
+
+namespace RE
+{
+	inline void NiFree(void* a_ptr)
+	{
+		using func_t = decltype(&NiFree);
+		static REL::Relocation<func_t> func{ ID::NiFree };
+		return func(a_ptr);
+	}
+
+	inline void* NiMalloc(std::size_t a_num)
+	{
+		using func_t = decltype(&NiMalloc);
+		static REL::Relocation<func_t> func{ ID::NiMalloc };
+		return func(a_num);
+	}
+
+	template <class T>
+	class NiTMallocInterface
+	{
+	public:
+		[[nodiscard]] static T* allocate(std::size_t a_num) { return NiMalloc(sizeof(T) * a_num); }
+		static void             deallocate(T* a_ptr) { NiFree(a_ptr); }
+	};
+
+	template <class T>
+	class NiTNewInterface
+	{
+	public:
+		[[nodiscard]] static T* allocate(std::size_t a_num) { return new T[a_num]; }
+		static void             deallocate(T* a_ptr) { delete[] a_ptr; }
+	};
+}