This is the Home Assistant's HASS.IO add-ons repository.
The add-on is installed like any other:
Navigate in your Home Assistant frontend to Settings -> Add-ons -> ADD-ON STORE.
Click 3-dots menu at upper right > Repositories and add this repository URL: https://github.com/ArtistAOP/hassio
Scroll down the page to find the new repository "Add-ons from ArtistAOP", and click one of the new add-ons (at this time Cybele only).
Click Install and give it a few minutes to finish downloading.
Configure at Configuration tab or separate file in Configuration folder according to the instructions of the selected add-on:
Click Start, give it a few seconds to spin up.
Enjoy.
For troubleshooting use Log tab