add go_card report

README.md

@@ -4,6 +4,7 @@
 <a href='https://github.com/jpoles1/gopherbadger' target='_blank'>![gopherbadger-tag-do-not-edit](https://img.shields.io/badge/Go%20Coverage-45%25-brightgreen.svg?longCache=true&style=flat)</a>
 <a href="https://discord.gg/kdf8a6T">![Discord](https://img.shields.io/discord/532383335348043777.svg)</a>
 [![Coverage Status](https://coveralls.io/repos/github/harmony-one/harmony/badge.svg?branch=master)](https://coveralls.io/github/harmony-one/harmony?branch=master)
+[![Go Report Card](https://goreportcard.com/badge/github.com/harmony-one/harmony)](https://goreportcard.com/report/github.com/harmony-one/harmony)
 
 ## Installation Requirements