add XMR donation address

[fugbixer]

projects like this can use bounties for fixing certain issues or
to refund instances, website costs etc.

therefore please add a XMR (Monero) address for donations since it's more privacy friendly

Thank you!

[mchangrh]

This is a third party implementation of a mirror, I think you mean ajayyy/SponsorBlockSite?

Cc @ajayyy

[fugbixer]

no, i would like to be able to donate for this project as well.
since its good that you provide a method to run mirrors.