manifest.json

{"short_name":"Blank Project","name":"Blank Project","start_url":"","display":"fullscreen","icons":[{"src":"thumbs/180.jpg","sizes":"180x180","type":"image/jpeg"},{"src":"thumbs/360.jpg","sizes":"360x360","type":"image/jpeg"},{"src":"thumbs/540.jpg","sizes":"540x540","type":"image/jpeg"},{"src":"thumbs/720.jpg","sizes":"720x720","type":"image/jpeg"}]}