docs: add macOS CI status badge to README

Signed-off-by: deadprogram <[email protected]>

README.md

@@ -4,6 +4,7 @@
 
 [![Go Reference](https://pkg.go.dev/badge/gocv.io/x/gocv.svg)](https://pkg.go.dev/gocv.io/x/gocv)
 [![Linux](https://github.com/hybridgroup/gocv/actions/workflows/linux.yml/badge.svg?branch=dev)](https://github.com/hybridgroup/gocv/actions/workflows/linux.yml)
+[![macOS](https://github.com/hybridgroup/gocv/actions/workflows/macos.yml/badge.svg?branch=dev)](https://github.com/hybridgroup/gocv/actions/workflows/macos.yml)
 [![Windows](https://github.com/hybridgroup/gocv/actions/workflows/windows.yml/badge.svg?branch=dev)](https://github.com/hybridgroup/gocv/actions/workflows/windows.yml)
 [![Go Report Card](https://goreportcard.com/badge/github.com/hybridgroup/gocv)](https://goreportcard.com/report/github.com/hybridgroup/gocv)
 [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://github.com/hybridgroup/gocv/blob/release/LICENSE.txt)