D7952: rust: add a README

[valentin.gatienbaron (Valentin Gatien-Baron)]

valentin.gatienbaron added a comment.
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  I didn't  mention `setup.py --rust` because the toplevel readme doesn't mention setup.py, so I don't really know if that's really how mercurial is intended to be built or an implementation detail.

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D7952/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D7952

To: valentin.gatienbaron, #hg-reviewers, Alphare
Cc: pulkit, gracinet, Alphare, mjpieters, mercurial-devel