Create first time contributor documentation

[thinkingserious]

Issue Summary

Our open sourced documentation has a great first time contributor page that we wish to duplicate here.

Acceptance Criteria

• We have a file in the root directory called first-timers.md or similar that helps a first time contributor make their first PR (please use our CONTRIBUTOR.md file for inspiration as well as this page)
• We provide a link to tasks with the labels "difficulty: easy" and "status: help wanted" (example query) to all the repos listed here, please scroll to the bottom.