Update readme with badges

README.md

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     /    |    \   /    |    \/\__|    /    |    \
     \____|__  /___\____|__  /\________\____|__  /
          web\/framework   \/                  \/ 
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 Ninja - web framework
 =====================
 
+[![Maven Central](https://img.shields.io/maven-central/v/org.ninjaframework/ninja?color=blue&style=flat-square)](https://mvnrepository.com/artifact/org.ninjaframework/ninja)
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+[![Java 8](https://img.shields.io/github/actions/workflow/status/ninjaframework/ninja/java8.yaml?branch=develop&label=Java%208&style=flat-square)](https://github.com/ninjaframework/ninja/actions/workflows/java11.yaml)
+[![Java 11](https://img.shields.io/github/actions/workflow/status/ninjaframework/ninja/java11.yaml?branch=develop&label=Java%2011&style=flat-square)](https://github.com/ninjaframework/ninja/actions/workflows/java11.yaml)
+[![Java 17](https://img.shields.io/github/actions/workflow/status/ninjaframework/ninja/java17.yaml?branch=develop&label=Java%2017&style=flat-square)](https://github.com/ninjaframework/ninja/actions/workflows/java17.yaml)
+[![Java 19](https://img.shields.io/github/actions/workflow/status/ninjaframework/ninja/java21.yaml?branch=develop&label=Java%2021&style=flat-square)](https://github.com/ninjaframework/ninja/actions/workflows/java21.yaml)
+
 Ninja is a full stack web framework for Java.
 Rock solid, fast and super productive.