f4jumble: Add description to README

Co-authored-by: Daira Hopwood <daira@jacaranda.org>
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# f4jumble
TBD
An implementation of the F4Jumble algorithm, an unkeyed variable-width
permutation.
F4Jumble is used by Zcash Unified Addresses and Unified Viewing Keys to
prevent certain kinds of malleation attacks, and is specified by [ZIP 316](https://zips.z.cash/zip316).
## License