Add hide-mode-line recipe

[hlissner]

Brief summary of what the package does

Provides hide-mode-line-mode. A simple, convenience minor mode that hides (or masks) the mode-line in your current buffer.

Direct link to the package repository

https://github.com/hlissner/emacs-hide-mode-line

Your association with the package

Maintainer.

Relevant communications with the upstream package maintainer

None needed

Checklist

Please confirm with x:

• The package is released under a GPL-Compatible Free Software License.
• I've read CONTRIBUTING.md
• I've used the latest version of package-lint to check for packaging issues, and addressed its feedback
• My elisp byte-compiles cleanly
• M-x checkdoc is happy with my docstrings
• I've built and installed the package using the instructions in CONTRIBUTING.md

[purcell]

Great! Merging now. Please add an ;;;###autoload cookie comment for the minor mode definition.

[hlissner]

@purcell And done! Thanks!