docs(readme): add report card badge

Signed-off-by: Bo-Yi Wu <[email protected]>

Author: appleboy

README.md

@@ -1,6 +1,7 @@
 # NSQ
 
 [![Run Testing](https://github.com/golang-queue/nsq/actions/workflows/go.yml/badge.svg)](https://github.com/golang-queue/nsq/actions/workflows/go.yml)
+[![Go Report Card](https://goreportcard.com/badge/github.com/golang-queue/queue)](https://goreportcard.com/report/github.com/golang-queue/queue)
 [![codecov](https://codecov.io/gh/golang-queue/nsq/branch/main/graph/badge.svg?token=D3CUES8M62)](https://codecov.io/gh/golang-queue/nsq)
 
 NSQ as backend with [Queue package](https://github.com/golang-queue/queue) (A realtime distributed messaging platform)