Create file:
nano -w /etc/portage/repos.conf/jr386078_overlay.conf
Copy and paste:
[jr386078_overlay]
location = /usr/local/portage/jr386078_overlay
sync-type = git
sync-uri = https://github.com/jr386078/jr386078_overlay.git
priority = 50
auto-sync = yes
Sync repository:
emaint sync --repo jr386078_overlay