docs: add plugin setup guide

plugin/lib/commonlibf4/include/Scaleform/S/StringDataPtr.h

@@ -0,0 +1,13 @@
+#pragma once
+
+namespace Scaleform
+{
+	class StringDataPtr
+	{
+	public:
+		// members
+		const char*   str;   // 00
+		std::uint64_t size;  // 08
+	};
+	static_assert(sizeof(StringDataPtr) == 0x10);
+}