Add goreport (#337)

Author: mkumatag

README.md

@@ -1,5 +1,6 @@
 [![LICENSE](https://img.shields.io/badge/license-apache2.0-green.svg)](https://github.com/kubernetes-sigs/cluster-api-provider-ibmcloud/blob/master/LICENSE)
 [![Releases](https://img.shields.io/badge/version-v0.0.1-orange.svg)](https://github.com/kubernetes-sigs/cluster-api-provider-ibmcloud/releases "Cluster API provider IBM Cloud latest release")
+[![Go Report Card](https://goreportcard.com/badge/github.com/kubernetes-sigs/cluster-api-provider-ibmcloud)](https://goreportcard.com/report/github.com/kubernetes-sigs/cluster-api-provider-ibmcloud)
 
 <!-- START doctoc generated TOC please keep comment here to allow auto update -->
 <!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->