Adds instructions for adding Nightwatch capability to local environment

[mradcliffe]

Fixes #192

This is probably more of a Proof of Concept that might be closed.

I didn't think we would want to add the chromedriver image as that would increase the package size, but maybe we do want this to be the default experience?

[rfay]

Shouldn't we be adding Nightwatch capability, not just instructions?

[mradcliffe]

I wasn't sure if we wanted to make it the default or not. Is there any risks for performance?

[rfay]

Do people usually need nightwatch? If so, I'd say add it. I don't think performance would be affected.