Add NumFOCUS donation link [ci skip]
Add NumFOCUS donation link [ci skip]

FrancescAlted/PyTables,PyTables/PyTables,avalentino/PyTables,FrancescAlted/PyTables,avalentino/PyTables,FrancescAlted/PyTables,avalentino/PyTables,PyTables/PyTables,PyTables/PyTables