QR Code generator library
https://www.nayuki.io/page/qr-code-generator-library
https://github.com/nayuki/QR-Code-generator
Simple C/C++ QRCode Library
https://www.codeproject.com/Articles/593591/Simple-C-Cplusplus-QRCode-Library
zxing 라이브러리
https://github.com/zxing/zxing
zxing 사용 예시
https://blog.naver.com/dlckdrl/50127346880
https://disroway.blog.me/110134918883
QR코드 관련 URL
