thats basically all it is if you want to install it, put it in your plugins directory presumebly:
$HOME/.config/kak/plugins/arturo.kak
and then add this to your kakrc:
source %val{config}/plugins/arturo.kak
or if you use plug.kak you can also just add this line to your kakrc:
plug "g3rwy/kakoune-arturo"
and it should be fine