docs: add plugin setup guide

plugin/lib/commonlibf4/include/Scaleform/G/GFx_ASStringBuiltinManagerT.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include "Scaleform/G/GFx_ASStringNodeHolder.h"
+
+namespace Scaleform::GFx
+{
+	class ASStringManager;
+
+	template <class T, std::int32_t STAT>
+	class ASStringBuiltinManagerT
+	{
+	public:
+		// members
+		ASStringNodeHolder builtins[STAT];  // 00
+		ASStringManager*   stringManager;   // ??
+		const char**       staticStrings;   // ??+08
+	};
+	static_assert(sizeof(ASStringBuiltinManagerT<void, 65>) == 0x218);
+}