To install just run the install script:
$ ./install.sh
To get all features working properly make sure you change your terminal font to hack (installed locally by the install.sh).
On iterm2 (OS X) I use Hack 12pt as regular font and Hack 16pt as Non-ASCII fontt (both anti-aliased).
Also make sure you are using xterm-256color as your TERM. You can do that by adding the following line to your ~/.bashrc:
export TERM=xterm-256color