How to download and setup docker
Open terminal and run command
git clone https://github.com/composer/docker.git
git clone is used to create a copy or clone of docker repositories.
You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with docker https://github.com/composer/docker/archive/master.zip
Or simply clone docker with SSH
[email protected]:composer/docker.git