Add badges to README

Author: bombsimon

README.md

@@ -1,5 +1,8 @@
 # JSON typedef infer
 
+[![Go Reference](https://pkg.go.dev/badge/github.com/bombsimon/jtd-infer-go.svg)](https://pkg.go.dev/github.com/bombsimon/jtd-infer-go)
+[![Build and test](https://github.com/bombsimon/jtd-infer-go/actions/workflows/go.yaml/badge.svg)](https://github.com/bombsimon/jtd-infer-go/actions/workflows/go.yaml)
+
 This is a port of [`json-typedef-infer`][jtd-infer] Go. The reason for porting
 this is that I was in need of JTD inference from code and not as a CLI tool.