Add Sponsor button to repository

[danieldegroot2]

What feature would you like to see added?

Add a Sponsor button to this(/these) repository(/ies), linking to the donation page at https://openstreetmap.app.neoncrm.com/forms/osmcha

GitHub allows users to add a custom sponsorship/donate/donation link button to their repositories. https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/displaying-a-sponsor-button-in-your-repository

Additionally, I would be willing to create a PR to add badges to the README.md(s), at least for the Donate page. Feel free to let me know if this is a good idea, and if so what others you would like to see. I have previously done this for other OSM-related repositories. OSMUS could also apply such thing organisation-wide with all repos, including charters, where (still) needed.

Examples

• https://github.com/OpenRailwayMap/OpenRailwayMap/pull/897
• https://github.com/umap-project/umap/blob/master/README.md

Why would this be useful to you or other users?

Allows (GitHub) users to more easily discover the Donate page. More prominently shows you are open to funding and similar.

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Part of https://github.com/osmus/osmcha-charter-project/issues/13, https://github.com/osmus/osmcha-charter-project/issues/15