Create Initial Roadmap for Drupal Diversity Team

Creating a roadmap for the Drupal Diversity team will help align work that cross many aspects of planning, collaboration, and execution of positive change. Yay!

A roadmap helps align like-bundles of tasks over time, too.

Some ideas for time:
* Quarterly per Calendar Year
* Fuzzy time

Some ideas for buckets:
* Education (materials created to educate folks)
* Outreach (event involvement)
* Code (DDI specific coding initiatives)
* Others...