app-misc/khard: add new package

app-misc/khard: add new package

khard is a console CardDAV client, from same author as app-misc/khal.

Adding it to main gentoo repo fulfills bug #601440.
Previously khard was in xmw overlay, which is no longer available.

Based on original ebuild by Kristian <kbx@posteo.de>.

Test phase will be implemented when upstream gets a test suite, waiting
for resolution of https://github.com/scheibler/khard/pull/96 .

Bug: https://bugs.gentoo.org/601440
Suggested-by: Kristian <kbx@posteo.de>
Reviewed-by: Andrey Utkin <andrey_utkin@gentoo.org>
Tested-by: Kristian <kbx@posteo.de>
Package-Manager: Portage-2.3.17, Repoman-2.3.6