Merge pull request #283 from asifdxtreme/patch-1

Add GoDoc and GoReport Card Widget

README.md

 # External Storage
 [![Build Status](https://travis-ci.org/kubernetes-incubator/external-storage.svg?branch=master)](https://travis-ci.org/kubernetes-incubator/external-storage)
+[![GoDoc](https://godoc.org/github.com/kubernetes-incubator/external-storage?status.svg)](https://godoc.org/github.com/kubernetes-incubator/external-storage)
+[![Go Report Card](https://goreportcard.com/badge/github.com/kubernetes-incubator/external-storage)](https://goreportcard.com/report/github.com/kubernetes-incubator/external-storage)
+
 ## External Provisioners
 This repository houses community-maintained external provisioners plus a helper library for building them. Each provisioner is contained in its own directory so for information on how to use one, enter its directory and read its documentation. The library is contained in the `lib` directory.