소프트웨어 설치(Mac OS)
https://hyperledger.github.io/composer/installing/installing-prereqs#macos
Installing the development environment
https://hyperledger.github.io/composer/installing/development-tools.html
Blockchain Car Auction Demo
https://drive.google.com/file/d/1kQ5AN2ugaLYQFSzp9_TliVR0Lz9xoAjx/view?usp=sharing