Add a README.org with info on installing dependencies and running the
app outside Emacs, and add a comment at the end of core.clj with info on
running the app inside Emacs with CIDER.
Change-Id: Ie7e73f71a98425092782facd80ceec2a8995bb0d
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5115
Reviewed-by: grfn <grfn@gws.fyi>
Autosubmit: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI
