docs: add CI badge (#44)

README.md

@@ -1,10 +1,13 @@
 # controller-runtime-viper
 
 [![Conventional Commits][conventional-commits-img]][conventional-commits]
+[![CI][CI-img]][CI]
 [![Go Report Card][report-card-img]][report-card]
 
 Wrapper package to support viper in controller-runtime based Operators. Works as a drop-in replacement for controller-runtime zap package.
 
+[CI-img]: https://github.com/statnett/controller-runtime-viper/actions/workflows/ci.yml/badge.svg
+[CI]: https://github.com/statnett/controller-runtime-viper/actions/workflows/ci.yml
 [conventional-commits-img]: https://img.shields.io/badge/Conventional%20Commits-1.0.0-%23FE5196?logo=conventionalcommits&logoColor=white
 [conventional-commits]: https://conventionalcommits.org
 [report-card-img]: https://goreportcard.com/badge/github.com/statnett/controller-runtime-viper