docs: add plugin setup guide

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

@@ -0,0 +1,23 @@
+#pragma once
+
+namespace Scaleform::GFx
+{
+	class ASStringManager;
+
+	class ASStringNode
+	{
+	public:
+		// members
+		const char*      data;     // 00
+		ASStringManager* manager;  // 08
+		union
+		{
+			ASStringNode* lower;
+			ASStringNode* next;
+		};  // 10
+		std::uint32_t refCount;   // 18
+		std::uint32_t hashFlags;  // 1C
+		std::uint32_t size;       // 20
+	};
+	static_assert(sizeof(ASStringNode) == 0x28);
+}