This is my repository of .ebuilds file
Create /etc/portage/repos.conf/gasma.conf file and add the following lines
[DEFAULT]
main-repo = gentoo
[gasma]
location = /var/lib/overlays/gasma
sync-type = git
sync-uri = https://github.com/MattiaG-afk/gasma
auto-sync = yes
clone-depth = 1
Now you have to run:
sudo emerge --sync gasma
If you need an ebuild but you don't know how to do it you can contact me and I'll do it for you (of course I'll add it here)