Add donation address for Bitcoin Cash

[tl121]

I suggest you add Bitcoin Cash (BCH) to the list of supported donations with an address and QR code to web page https://grapheneos.org/donate. I suggest using Electron Cash as your BCH wallet.

If you do this, I guarantee you will get at least one contribution., probably more because the BCH community has a tradition of donations to various projects and has a blockchain network with lots of capacity, unlike some other cryptos.