Add recipe for germanium

[matsuyoshi30]

Brief summary of what the package does

Tool for generating an image from source code using germanium.

Package users can generate an image from a buffer or region.

Direct link to the package repository

https://github.com/matsuyoshi30/germanium-el

Your association with the package

Author, maintainer

Relevant communications with the upstream package maintainer

None needed

Checklist

• The package is released under a GPL-Compatible Free Software License
• I've read CONTRIBUTING.org
• 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.org
• I have confirmed some of these without doing them

[riscy]

Thanks for your close adherence for the checklist, and great work taking care of shell-quoting the arguments.

Minor lints, but none of these are blockers:

• germanium.el#L134: This double negation can be collapsed (not aliases null)
• On a quick first pass, I think most of the errors could be turned into user-errors
• "Please ensure Emacs's PATH and the installing" -> "Please ensure it is on Emacs's PATH and is installed"