New port: deskutils/meteo

Know the forecast of the next hours & days. Meteo is a forecast
application developed with Vala & Gtk, using OpenWeatherMap API.

WWW: https://gitlab.com/bitseater/meteo

PR: 236350
Submitted by: Hiroki Tagato <tagattie@yandex.com>
Approved by: miwi (mentor)
Differential Revision: https://reviews.freebsd.org/D19613