add Gitter link, also, we should have a development branch
add Gitter link, also, we should have a development branch

codebar/planner,despo/planner,boddhisattva/planner,matyikriszta/planner,deniseyu/planner,spike01/planner,margOnline/planner,laszpio/planner,despo/planner,spike01/planner,codebar/planner,deniseyu/planner,deniseyu/planner,despo/planner,codebar/planner,despo/planner,dondonz/planner,margOnline/planner,lislis/planner,dondonz/planner,webycel/planner,webycel/planner,lislis/planner,boddhisattva/planner,dondonz/planner,ndchorley/planner,ndchorley/planner,laszpio/planner,laszpio/planner,ndchorley/planner,laszpio/planner,codebar/planner,lislis/planner,margOnline/planner,spike01/planner,webycel/planner,matyikriszta/planner,boddhisattva/planner,matyikriszta/planner,spike01/planner