> Open source projects can also express their funding models directly from their repositories. When .github/FUNDING.yml is added to a project’s master branch, a new “Sponsor” button will appear at the top of the repository. Clicking the button opens a natively rendered view of the funding models listed in that file.
> The YAML format is flexible, so a project’s maintainers and contributors can decide how they want to fund the project on their own terms. They can showcase any (or all!) of the following: the GitHub Sponsors profiles of the developers who contribute to the project; a list of popular funding models including Open Collective, Community Bridge, Tidelift, Ko-fi, and Patreon; and custom links to alternative funding models.
From https://github.blog/2019-05-23-announcing-github-sponsors-a-....