docs: add plugin setup guide

plugin/lib/commonlibf4/include/Scaleform/R/Render_ThreadCommand.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include "Scaleform/R/RefCountBase.h"
+
+namespace Scaleform::Render
+{
+	class __declspec(novtable) ThreadCommand :
+		public RefCountBase<ThreadCommand, 2>  // 00
+	{
+	public:
+		// add
+		virtual void Execute() = 0;  // 01
+	};
+	static_assert(sizeof(ThreadCommand) == 0x10);
+}