Delete this repo

[eam]

@imeyer I want to delete this repo ytoolshed/libcrange in favor of https://github.com/square/libcrange/ which has a ton of bugfixes and is current. Any objections? I think I incorporated all the good stuff you did here, double check me and nuke it?

[robert-chiniquy]

Tragic.

[mschilli]

Fine by me. :)

[eam]

Opted to reduce down to a README.