Add mail/py-alot: Terminal MUA using Notmuch mail

Alot is a terminal-based mail user agent based on the Notmuch mail indexer.
It is written in Python using the Urwid toolkit and features a modular and
command prompt driven interface to provide a full MUA experience as an
alternative to the Emacs mode shipped with Notmuch.

WWW: https://github.com/pazz/alot

PR: 204982
Submitted by: Dhananjay Balan <mail@dbalan.in>