Add ensembling best practices

[tpendragon]

Introduction

We should document our best practices for Ensembling, so we can continue to revise them.

Acceptance criteria

• [ ] Includes "Initiative Order" - an order of drivers generated at the start of the ensemble by having everyone type into google "Roll 1d20" and ordering appropriately.
• [ ] Include the reasons we ensemble
  • Build up shared understanding of a problem and solution.
  • Low-stress way to collaboratively learn.
  • ??

[hackartisan]

probably add to https://pulibrary.github.io/dls-handbook/development_practice.html