added badges

Author: jakobbraun

README.md

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 # UDF Debugging Tools for Java
 
+[![Build Status](https://travis-ci.com/exasol/udf-debugging-java.svg?branch=master)](https://travis-ci.com/exasol/udf-debugging-java)
+[![Maven Central](https://img.shields.io/maven-central/v/com.exasol/udf-debugging-java)](https://search.maven.org/artifact/com.exasol/udf-debugging-java) 
+
 This repository contains tools for debugging UDFs.
 
 ## Installation