Basic project metadata

[dgarijo]

There is no license.
Also, it's unclear which version of Java it's needed to run the project.

[m-markovic]

added more info on JAVA version + License

[stefanogermano]

I suggest using a "standard" README (for instance, one of those available here, but there are many other examples on GitHub), to avoid forgetting something important in our documentation (we have already had a couple of issues in this project about that).