This is not really an App. In Chrome you can add any website as an App to your homescreen be it mobile or desktop.
Though @Falco could this option maybe added to user preferences page? Maybe first page? Or maybe even the Discobot tutorial with a query that will also show the install ap link
In the meantime is there a link code you could share?
The hardiness of having this for novice users and others a like that might not be aware would be a boon for installing app on multiple devices.