Update README.md

README.md

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 # service-center 
 [![Build Status](https://travis-ci.org/ServiceComb/service-center.svg?branch=master)](https://travis-ci.org/ServiceComb/service-center)   [![Coverage Status](https://coveralls.io/repos/github/ServiceComb/service-center/badge.svg?branch=master)](https://coveralls.io/github/ServiceComb/service-center?branch=master)  [![Go Report Card](https://goreportcard.com/badge/github.com/ServiceComb/service-center)](https://goreportcard.com/report/github.com/ServiceComb/service-center)  [![GoDoc](https://godoc.org/github.com/ServiceComb/service-center?status.svg)](https://godoc.org/github.com/ServiceComb/service-center)
 
-A standalone service center allows services to register their instance information and to discover providers of a given service.
+A standalone service center allows services to register their instance information and to discover providers of a given service. It also offers an awesome [web portal](/frontend) to manage the micro-services.
 
 ## Quick Start