Add the following to /etc/pacman.conf and refresh the pacman
package databases:
[custom]
Server = https://aur.bagru.at/custom
You can show the packages in this repository with
pacman -Sl custom.
Disclaimer
Use at your own risk. This repository is not maintained very well,
i.d. packages I don't use are not updated regularly and may be
removed any time without prior notice.