I have github sponsorship enabled through my github repo.
I'm wanting to add a 'sponsor' button into the actual readme.md as well as another website.
Is there some what to add the sponsor button to these type of locations?
shields.io has support for GitHub Sponsors badge. Go to https://shields.io/badges/git-hub-sponsors to create one.
For example:

Replace <username> with your GitHub username.
would display a badge

If you want to make it clickable:
[](https://github.com/sponsors/<username>)
Replace <username> with your GitHub username.
would display a badge

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