Co-authored-by: Pratyush Mishra <pratyushmishra@berkeley.edu>

Pratyush noticed a comment regarding COEFF_A has not been updated. This PR fixes so.

* impl bandersnatch

* clean up

* update changelog

* Relocate the readme so they show up in the doc

* Delete README.md

* Relocate the changelog entry

* rename & fmt

Co-authored-by: Weikeng Chen <w.k@berkeley.edu>