Add the maven badge

Author: sink772

README.md

@@ -1,4 +1,6 @@
-# Annotation processor for JAVA SCORE
+[![Maven Central](https://maven-badges.herokuapp.com/maven-central/foundation.icon/javaee-annotation-processor/badge.svg)](https://search.maven.org/search?q=g:foundation.icon%20a:javaee-annotation-processor)
+
+# Annotation Processor for Java SCORE
 
 ## AnnotationProcessor
 
@@ -9,4 +11,4 @@
 
 ## License
 
-This project is available under the [Apache License, Version 2.0](LICENSE).
+This project is available under the [Apache License, Version 2.0](LICENSE).