Add my (hurried) writeup on acceptance testing
Add my (hurried) writeup on acceptance testing

I ran out of time before leaving GDS. I think I've
captured the main points. Someone may wish to pick
this up and add more detail / do more investigation.

alphagov/specialist-publisher,alphagov/specialist-publisher-rebuild,alphagov/specialist-publisher-rebuild,alphagov/specialist-publisher,alphagov/specialist-publisher-rebuild,alphagov/specialist-publisher-rebuild,alphagov/specialist-publisher