[ELPA] Add Denote package

[Protesilaos Stavrou]

Hello everyone,

I have a new package that I would like to contribute to the FSF via GNU
ELPA.  It is called "denote" and aims to be a simple tool for taking
notes in a flat directory using a strict and efficient file-naming
scheme.  Denote provides the means to create links between notes and can
produce a buffer with backlinks to the current one ("backlinks" are the
links in other notes pointing to the present entry).

Denote creates Org files by default, but there is an option to use plain
text (.txt) or Markdown with either YAML or TOML notation for the file's
front matter (the area at the top with the tile, date, tags).

The webpage of the manual: <https://protesilaos.com/emacs/denote>.  It
is comprehensive and covers everything one needs.

I have received patches from Damien Cassou (FSF-covered), Kaushal Modi
(FSF-covered), and Jack Baty (small; below the threshold).

What do you think?  Can I install the attached patch in elpa.git?  Do
you want me to explain more about this package?  Something else to
consider?

[ I will tag a release once the patch is installed. ]

All the best,
Protesilaos (or simply "Prot")

-- 
Protesilaos Stavrou
https://protesilaos.com

0001-elpa-packages-denote-New-package.patch
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