Add paperless recipe

[atgreen]

Brief summary of what the package does

Paperless is a major mode for sorting and filing PDF documents.

Direct link to the package repository

https://github.com/atgreen/paperless

Your association with the package

I am the author.

Relevant communications with the upstream package maintainer

None needed

Checklist

• [*] I've read CONTRIBUTING.md
• [*] I've used package-lint to check for packaging issues, and addressed its feedback
• [*] I've built and installed the package using the instructions in the README

[syohex]

• No package dependency header, f, s, cl-lib
• Global variables should be declared by defvar, like paperless--table-contents, paperless--directory-list)
• Customize variables should be declared by defcustom, like *paperless-root-dir*, *paperless-capture-dir*. And Emacs Lisp coding convention, * should not be used for global variable unlike common lisp
• There are too many byte-compile warnings.

[atgreen]

Thanks for the review @syohex. I've committed changes, and it should be good to go now.

[syohex]

Merged