Documentation improvements - collaboration, setup, and guides#426

Merged

jaronheard merged 2 commits intomasterfrom update/documentation

Apr 3, 2019

+38-9

Commits on Mar 15, 2019

readme - add collab section, clarify setup
jaronheard
committed

Commits on Apr 3, 2019

Update issues to to good-first-issue link
jaronheard
authored