Add Thrissur Debian Release Party to events

events/details/003-debian-stretch-release-party.yaml

+id: "3"
+name: "Debian Stretch Release Party - Thrissur"
+lat: ""
+lng: ""
+locationame: "St.Mary's College"
+organizedby: "FSUG Thrissur, ICFOSS and KSSP"
+when: "2017-07-05 09:30 AM to 12:30 PM"
+description: "Debian Stretch Release Party along with GNU/Linux Install Fest - Thrissur"
+contactinfo: "Riot room #fsugtcr:matrix.org"
+imgurl: "https://placehold.it/150x150"