docs: add plugin setup guide

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

@@ -0,0 +1,21 @@
+#pragma once
+
+#include "Scaleform/T/ThreadId.h"
+
+namespace Scaleform::Render
+{
+	class HAL;
+	class Renderer2D;
+	class TextureManager;
+
+	class Interfaces
+	{
+	public:
+		// members
+		TextureManager* textureManager;  // 00
+		HAL*            hal;             // 08
+		Renderer2D*     renderer2D;      // 10
+		ThreadId        renderThreadID;  // 18
+	};
+	static_assert(sizeof(Interfaces) == 0x20);
+}