Add Portugal hiring info

@andr3 I stole some of the wording you sent me on slack, kindly review and feel free to suggest changes. @filipa @pedroms @marcia I would love your input here too!

@jhurewitz for final review and merging.

cc @spestorich for visibility (I can't seem to tag the entire Recruiting team with @gl-recruiting any longer, can you share this update with the team engineering and non-engineering?)