Add maven badge

Author: acoburn

README.md

@@ -4,6 +4,7 @@ The projects in this repository make use of [Apache Camel](https://camel.apache.
 
 [![Build Status](https://travis-ci.com/trellis-ldp/camel-ldp-recipes.svg?branch=master)](https://travis-ci.com/trellis-ldp/camel-ldp-recipes)
 [![Coverage Status](https://coveralls.io/repos/github/trellis-ldp/camel-ldp-recipes/badge.svg?branch=master)](https://coveralls.io/github/trellis-ldp/camel-ldp-recipes?branch=master)
+[![Maven Central](https://maven-badges.herokuapp.com/maven-central/org.trellisldp/camel-ldp-recipes/badge.svg)](https://maven-badges.herokuapp.com/maven-central/org.trellisldp/camel-ldp-recipes/)
 
 The current integrations include: