Have a small markdown file 'mini-contributing' that is shown on top of PR / issue creation
This is based on feedback of the open source community:
Issues and pull requests are often created without any adherence to the CONTRIBUTING.md contribution guidelines, due to the inconspicuous nature of the “guidelines for contributing” link when creating an issue and the fact that it often contains a lot of information that isn’t relevant to opening issues (such as information about hacking on the project). Maintainers should be able to configure a file in the repo (interpreted as GFM) to be displayed at the top of the new issue / PR page instead of that link. Maintainers can choose to inline content there and / or link to other pages as appropriate.