Add use of OIDC

[clarkio]

This issue is for a: (mark with an x)

- [ ] bug report -> please search issues before submitting
- [x] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

Expected/desired behavior

Provide authentication with the OpenID Connect protocol

Mention any other details that might be useful

Suggestion based on #10. See discussion there for more details.
Also: https://openid.net/developers/certified/