Create a visual representation of our Open Source workflow

## Problem

As we evolve as a community, we are evolving our open source workflow. Currently we have been trying to add a QA testing step to how we handle pull requests, and this is not yet visually represented. I think this could clear up confusion from new and current contributors.

In the past, we had this open source workflow: http://systers.io/open-source-workflow

Today we have a specific way of assigning labels to define the status of PRs and issues. We want to have this visually represented.

To help understand some of our workflow currently being followed, check our [Open Source teams guide](https://docs.google.com/document/d/1bt1Dfi_LK8-IDOX-vxgc_PT-CGP4sWhSI5TT4amtLMY/edit).

## Tasks

- [ ] Create a visual representaiton that explains ourcurrent open source wokflow.