docs: add plugin setup guide

plugin/lib/commonlibf4/include/RE/B/BSTAtomicValue.h

@@ -0,0 +1,55 @@
+#pragma once
+
+namespace RE
+{
+	template <class T>
+	class BSTAtomicValue
+	{
+	public:
+		static_assert(std::is_integral_v<T>);
+
+		using value_type = T;
+
+		constexpr BSTAtomicValue() noexcept = default;
+
+		explicit constexpr BSTAtomicValue(T a_rhs) noexcept :
+			_value(a_rhs)
+		{}
+
+		T operator++()
+		{
+			REX::TAtomicRef value{ _value };
+			return ++value;
+		}
+
+		[[nodiscard]] T operator++(int)
+		{
+			REX::TAtomicRef value{ _value };
+			return value++;
+		}
+
+		T operator--()
+		{
+			REX::TAtomicRef value{ _value };
+			return --value;
+		}
+
+		[[nodiscard]] T operator--(int)
+		{
+			REX::TAtomicRef value{ _value };
+			return value--;
+		}
+
+		[[nodiscard]] value_type&       load_unchecked() noexcept { return _value; }
+		[[nodiscard]] const value_type& load_unchecked() const noexcept { return _value; }
+
+	private:
+		// members
+		value_type _value{ 0 };  // 0
+	};
+
+	extern template class BSTAtomicValue<std::int32_t>;
+	extern template class BSTAtomicValue<std::uint32_t>;
+	extern template class BSTAtomicValue<std::int64_t>;
+	extern template class BSTAtomicValue<std::uint64_t>;
+}