Add required info for Sonatype OSS

I didn't see this artifact in a public Maven repository. If you're interested in having it hosted somewhere you might consider Sonatype OSS. They'll host it for free (including SNAPSHOTs) and sync to Maven Central. In addition to this pull request you'll need to add a license file to your repo and pom and follow the instructions here: https://docs.sonatype.org/display/Repository/Sonatype+OSS+Maven+Repository+Usage+Guide

It's pretty painless.