add more badges to README.md

Author: presbrey

README.md

@@ -1,7 +1,10 @@
 # MultiProxy Client for Go
 
-![Go Test](https://github.com/presbrey/go-multiproxy/workflows/Go%20Test/badge.svg)
+[![Go Report Card](https://goreportcard.com/badge/github.com/presbrey/go-multiproxy)](https://goreportcard.com/report/github.com/presbrey/go-multiproxy)
 [![codecov](https://codecov.io/gh/presbrey/go-multiproxy/branch/main/graph/badge.svg)](https://codecov.io/gh/presbrey/go-multiproxy)
+![Go Test](https://github.com/presbrey/go-multiproxy/workflows/Go%20Test/badge.svg)
+[![GoDoc](https://godoc.org/github.com/presbrey/go-multiproxy?status.svg)](https://godoc.org/github.com/presbrey/go-multiproxy)
+[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 
 ## Overview