chore: import upstream snapshot with attribution

zxing-cpp/include/ZXing/TextUtfEncoding.h

@@ -0,0 +1,19 @@
+/*
+* Copyright 2016 Nu-book Inc.
+*/
+// SPDX-License-Identifier: Apache-2.0
+
+#pragma once
+
+#include <string>
+#include <string_view>
+
+namespace ZXing::TextUtfEncoding {
+
+// The following functions are not required anymore after Barcode::text() now returns utf8 natively and the encoders accept utf8 as well.
+
+[[deprecated]] std::string ToUtf8(std::wstring_view str);
+[[deprecated]] std::string ToUtf8(std::wstring_view str, const bool angleEscape);
+[[deprecated]] std::wstring FromUtf8(std::string_view utf8);
+
+} // namespace ZXing::TextUtfEncoding