Add Go status badge

Author: awnumar

README.md

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 # Age Key Derivation - Go
 
-[![Go Reference](https://pkg.go.dev/badge/github.com/awnumar/agekd.svg)](https://pkg.go.dev/github.com/awnumar/agekd)
+[![Go Reference](https://pkg.go.dev/badge/github.com/awnumar/agekd.svg)](https://pkg.go.dev/github.com/awnumar/agekd) [![Go workflow](https://github.com/awnumar/agekd/actions/workflows/go.yml/badge.svg?branch=main)](https://github.com/awnumar/agekd/actions/workflows/go.yml)
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 `agekd` is a Go library that can be used to derive [`age`](https://github.com/FiloSottile/age) X25519 identities deterministically from keys or passwords.