Add build, coverage and report badges
# GLBC
+[![Build Status](https://travis-ci.org/kubernetes/ingress-gce.svg?branch=master)](https://travis-ci.org/kubernetes/ingress-gce)
+[![Coverage Status](https://coveralls.io/repos/github/kubernetes/ingress-gce/badge.svg?branch=master)](https://coveralls.io/github/kubernetes/ingress-gce?branch=master)
+[![Go Report Card](https://goreportcard.com/badge/github.com/kubernetes/ingress-gce)](https://goreportcard.com/report/github.com/kubernetes/ingress-gce)
+
GLBC is a GCE L7 load balancer controller that manages external loadbalancers configured through the Kubernetes Ingress API.
## A word to the wise
