Update README.md

Author: j5ik2o

README.md

@@ -1,6 +1,6 @@
 # docker-controller-scala
 
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+[![Scala CI](https://github.com/j5ik2o/docker-controller-scala/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/j5ik2o/docker-controller-scala/actions/workflows/ci.yml)
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.github.j5ik2o/docker-controller-scala-core_2.13/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.github.j5ik2o/docker-controller-scala-core_2.13)
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