Clarify Expectations for Implementers

[mmccool]

• README and instructions are too terse (@egekorkan is working on a PR)
• Github issues may not be the best way to do things
• Need to clarify procedure and expectations - manual.csv contributions is main issue right now
• Sending emails would be useful

[mmccool]

Let's close this after Fady reviews (e.g. after discussing again in Day 2 of the 2022.07 Testfest)