Add process for PR acceptance, review, rejection

This is an extremely tentative PR.  However, I feel that the suggestions are generally good.

Docker-DCO-1.1-Signed-off-by: Timothy Hobbs <timothyhobbs@seznam.cz> (github: timthelion)
@fredlf Non-English meddler talking here; shouldn't the ”n” only appear in front of a *vowel* (or something that *sounds like* a vowel)? ”*an* LGTM” seems like a real tongue-twister