I have documentation at
http://packagecore.readthedocs.io/en/latest/02_intro/ (though there's
certainly room for improvement). If you have any specific questions, let
me know, as it will be helpful in determining where I need to flush out
the documentation.

I have one of my projects set up to build packages and upload to github
with PackageCore and Travis-CI that may be helpful (see the
`.travis.yml` and the `packagecore.yaml`):
https://github.com/dlasalle/wildriver