Include Github links on README for Project Team

[jacebryan]

Please consider adding Github links to the README file under the Project Team section.

As an example: https://github.com/SFDO-Sprint-2019-Detroit/CumulusCI-Process-for-Customers-and-Partners#project-team

Doing so will help other members of our community connect with one another in Github.

You can find a list of all community members who attended the Detroit Sprint here.