FUNDING.yml (#3523)
FUNDING.yml (#3523)

add NumFOCUS github sponsors button (recurring donations only)

This feature launched today at GitHub Universe!

Also add the custom link to point to the donation form for xarray.

cc @shoyer
pydata/xarray,xray/xray,pydata/xarray,pydata/xarray,jhamman/xarray,shoyer/xarray,markelg/xray,shoyer/xarray,jhamman/xarray,jhamman/xarray,markelg/xray,markelg/xray