Adding Go Report Card badge (#189)

README.md

@@ -1,5 +1,6 @@
 ![Ingress Controller - Status](https://img.shields.io/badge/project--status-beta-orange.svg)
 [![Build Status](https://travis-ci.org/Azure/application-gateway-kubernetes-ingress.svg?branch=master)](https://travis-ci.org/Azure/application-gateway-kubernetes-ingress)
+[![Go Report Card](https://goreportcard.com/badge/Azure/application-gateway-kubernetes-ingress)](https://goreportcard.com/report/Azure/application-gateway-kubernetes-ingress)
 
 The Application Gateway Ingress Controller allows the [Azure Application Gateway](https://azure.microsoft.com/en-us/services/application-gateway/) to be used as the ingress for an [Azure Kubernetes Service](https://azure.microsoft.com/en-us/services/kubernetes-service/) aka AKS cluster. As shown in the figure below, the ingress controller runs as a pod within the AKS cluster. It consumes [Kubernetes Ingress Resources](https://kubernetes.io/docs/concepts/services-networking/ingress/) and converts them to an Azure Application Gateway configuration which allows the gateway to load-balance traffic to Kubernetes pods.