chore(contributing): add note about windows situation
chore(contributing): add note about windows situation

ricardo-mello/ionic-cli,driftyco/ionic-cli,devtotvs/thf-mobile-cli,devtotvs/thf-mobile-cli,ricardo-mello/ionic-cli,driftyco/ionic-cli,ricardo-mello/ionic-cli,devtotvs/thf-mobile-cli,driftyco/ionic-cli