Add a donate button to README.md.

[rryan]

This is pretty low-key. Thoughts?

[Holzhaus]

What about adding a github sponsor button instead? I think that is a bit more prominent. https://help.github.com/en/github/administering-a-repository/displaying-a-sponsor-button-in-your-repository

We can use the custom URL option to link to PayPal.

[rryan]

Here's what the Sponsor button would look like for comparison: https://github.com/rryan/mixxx (it has to be on master so I don't think you can preview from a PR).

Personally it feels more hidden to me, but I guess if the Sponsor button catches on them people will come to expect it at the top of the page.

It also takes 2 clicks and displays the bare URL which is kind of ugly.

[rryan]

on second thought, ¿porque no los dos?

[ronso0]

on second thought, ¿porque no los dos?

👍 Exactly, let's use both.

[ywwg]

lgtm!