Added instruction to install gulp to readme
Added instruction to install gulp to readme

devgateway/ocua,devgateway/ocvn,devgateway/dg-toolkit,devgateway/oc-explorer,devgateway/ocua,devgateway/ocvn,devgateway/oc-explorer,devgateway/ocvn,devgateway/dg-toolkit,devgateway/ocua,devgateway/oc-explorer,devgateway/dg-toolkit