chore: import upstream snapshot with attribution

zxing-cpp/include/ZXing/BitMatrixIO.h

@@ -0,0 +1,21 @@
+/*
+* Copyright 2017 Huy Cuong Nguyen
+* Copyright 2017 Axel Waggershauser
+*/
+// SPDX-License-Identifier: Apache-2.0
+
+#pragma once
+
+#include <string>
+
+#include "BitMatrix.h"
+
+namespace ZXing {
+
+std::string ToString(const BitMatrix& matrix, bool inverted = false);
+std::string ToString(const BitMatrix& matrix, char one, char zero = ' ', bool addSpace = true, bool printAsCString = false);
+std::string ToSVG(const BitMatrix& matrix);
+BitMatrix ParseBitMatrix(const std::string& str, char one = 'X', bool expectSpace = true);
+void SaveAsPBM(const BitMatrix& matrix, const std::string filename, int quietZone = 0);
+
+} // ZXing