add cronjob example to readme
add cronjob example to readme

BuildingSync/projectmonitor,genebygene/projectmonitor,dgodd/projectmonitor,remind101/projectmonitor,CodeforHawaii/projectmonitor,BuildingSync/projectmonitor,pivotal/projectmonitor,genebygene/projectmonitor,remind101/projectmonitor,CodeforHawaii/projectmonitor,pivotal/projectmonitor,BuildingSync/projectmonitor,genebygene/projectmonitor,genebygene/projectmonitor,pivotal/projectmonitor,CodeforHawaii/projectmonitor,mabounassif/projectmonitor-docker,mabounassif/projectmonitor-docker,dgodd/projectmonitor,dgodd/projectmonitor,BuildingSync/projectmonitor,mabounassif/projectmonitor-docker,mabounassif/projectmonitor-docker,pivotal/projectmonitor,remind101/projectmonitor,remind101/projectmonitor,dgodd/projectmonitor