Update README.md

Author: stefan-ka

README.md

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-# context-mapper-archunit-extension
+![Context Mapper](https://raw.githubusercontent.com/wiki/ContextMapper/context-mapper-dsl/logo/cm-logo-github-small.png) 
+# Context Mapper ArchUnit Extension 
+[![Build (master)](https://github.com/ContextMapper/context-mapper-archunit-extension/actions/workflows/build_master.yml/badge.svg)](https://github.com/ContextMapper/context-mapper-archunit-extension/actions/workflows/build_master.yml) [![codecov](https://codecov.io/gh/ContextMapper/context-mapper-archunit-extension/branch/master/graph/badge.svg)](https://codecov.io/gh/ContextMapper/context-mapper-archunit-extension) [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0) [![Maven Central](https://img.shields.io/maven-central/v/org.contextmapper/context-mapper-archunit-extension.svg?label=Maven%20Central)](https://search.maven.org/search?q=g:%22org.contextmapper%22%20AND%20a:%22context-mapper-archunit-extension%22)
+
 Test your code against the CML model with ArchUnit