Add support for Maven

[dcramer]

Not sure if its possible, but it would be great to be able to track Java downloads

[stayallive]

Looks like NVM does not really publish any (useful or public) statistics.

https://blog.sonatype.com/2010/12/now-available-central-download-statistics-for-oss-projects/

Although an old blog post I cannot find that much more info about it.

All ears about places we can crawl or get download stats for Maven.