Added js config example
Added js config example

cookchristopher/BackstopJS,garris/BackstopJS,thepechinator/BackstopJS,mirzazeyrek/BackstopJS,thepechinator/BackstopJS,cookchristopher/BackstopJS,klausbayrhammer/BackstopJS,klausbayrhammer/BackstopJS,garris/BackstopJS,mirzazeyrek/BackstopJS,garris/BackstopJS