Add Go Report Card (#593)

README.md

@@ -2,8 +2,10 @@
 
 Dapr is a portable, event-driven, serverless runtime for building distributed applications across cloud and edge.
 
+[![Go Report Card](https://goreportcard.com/badge/github.com/dapr/dapr)](https://goreportcard.com/report/github.com/dapr/dapr)
 [![Build Status](https://dev.azure.com/azure-octo/Dapr/_apis/build/status/builds/dapr%20build?branchName=master)](https://dev.azure.com/azure-octo/Dapr/_build/latest?definitionId=5&branchName=master)
 
+
 - [dapr.io](https://dapr.io)
 - [@DaprDev](https://twitter.com/DaprDev)
 - [gitter.im/Dapr](https://gitter.im/Dapr/community)