Markdown READMEs are becoming increasingly ubiquitous for many projects. GitHub, GitLab, Bitbucket, among others, happily detect .md readme files and render them in their web interfaces. rST is nice, but is generally overkill for single-page documents (as opposed to more intricate documentation). To get something done sooner, rather than later, I'd prefer to come up with a two-phase solution, one narrow and "opt-in" (status-quo for all existing packages unless the maintainer does something) for quick implementation with hopefully minimal pushback. The other, later, not-proposed-here, could be more feature-rich/heuristic.