update readme

Author: stefanseifert

README.md

@@ -3,3 +3,10 @@
 [![Build Status](https://travis-ci.org/wcm-io-devops/maven-nodejs-proxy.png?branch=develop)](https://travis-ci.org/wcm-io-devops/maven-nodejs-proxy)
 
 Maven proxy to download NodeJS binaries as Maven artifacts.
+
+Steps to build and start the proxy:
+
+- Go to maven-nodejs-proxy directory
+- Build server with `mvn clean install`
+- Start server with `java -jar target/io.wcm.devops.maven.nodejs-proxy-<version>.jar server config.yml`
+- Go to http://localhost:8080 for further instructions