Update README.md: AnonFiles was deleted due to the shutdown

[twizco]

AnonFiles was deleted due to the shutdown

• My submission is formatted according to the guidelines in the contributing guide
• My addition is ordered alphabetically
• My submission has a useful description
• The description does not have more than 100 characters
• The description does not end with punctuation
• Each table column is padded with one space on either side
• I have searched the repository for any relevant issues or pull requests
• Any category I am creating has the minimum requirement of 3 items
• All changes have been squashed into a single commit