add badges to readme

README.md

@@ -1,3 +1,7 @@
 # go-memoizer
 
-A simple memoizer for Go.
+A simple memoizer for Go.
+
+[![Reference](http://img.shields.io/badge/go-documentation-blue.svg?style=flat-square)](https://pkg.go.dev/github.com/LightningDev1/go-memoizer)
+[![Linter](https://goreportcard.com/badge/github.com/LightningDev1/go-memoizer?style=flat-square)](https://goreportcard.com/report/github.com/LightningDev1/go-memoizer)
+[![Build status](https://github.com/LightningDev1/go-memoizer/actions/workflows/ci.yml/badge.svg)](https://github.com/LightningDev1/go-memoizer/actions)