docs: add plugin setup guide

plugin/lib/commonlibf4/include/Scaleform/A/Atomic.h

@@ -0,0 +1,21 @@
+#pragma once
+
+namespace Scaleform
+{
+	template <class T>
+	class AtomicValueBase
+	{
+	public:
+		// members
+		volatile T value;  // 0
+	};
+	static_assert(sizeof(AtomicValueBase<std::int32_t>) == 0x04);
+
+	template <class T>
+	class AtomicInt :
+		public AtomicValueBase<T>  // 0
+	{
+	public:
+	};
+	static_assert(sizeof(AtomicInt<std::int32_t>) == 0x04);
+}