Added folder for overlays as well as example overlay.
Added folder for overlays as well as example overlay.

ciberch/node-activities-boilerplate,praveenjha527/node-express-boilerplate,mape/node-express-boilerplate,ciberch/node-express-boilerplate,nickjenkin/moody-chef,toantran/scrumtrak,dongguangming/node-express-boilerplate