link GNU Coding Standards and Information for Maintainers of GNU Software
Add links to compatible and relevant rules in GNU.
Thanks to FĂ©licien Pillot for bringing this idea and finding some matching rules:
https://lists.globalcode.info/mailman3/hyperkitty/list/sane-software@lists.globalcode.info/thread/LVFFEQREQ2LBZGWVJIFTZE2QV3AGF5RO/
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