new port: graphics/rubygem-gemojione

Gem containing EmojiOne unicode/image assets

WWW: https://github.com/jonathanwiesel/gemojione

PR: 200125
Differential Revision: https://reviews.freebsd.org/D2527
Submitted by: Torsten Zuehlsdorff <ports@toco-domains.de>
Approved by: mat (mentor)