A command-line tool for working with a log of Architecture Decision Records (ADRs).ADRs are stored in a subdirectory of your project as Markdown files. The default directory is doc/adr, but you can specify the directory when you initialise the ADR log.
Installation Steps:
- Open Terminal using Spotlight search by pressing  
<command+space>.
Type terminal and hitEnterkey. - Now, run 
ruby -e “$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)” < /dev/null 2> /dev/null - Install adr-tools using brew
brew install adr-tools 
adr-tools is ready to use now!