Explain how to add module declaration to Java 8 code base

[nipafx]

Ideas:

• separate build steps
• assemble descriptor with Moditect

[filiphr]

I am extremely interested in this. Was recently looking into a way of adding module declarations by using Multi Release Jars, but I found the tooling a bit lacking. Especially integration with the IDE. Ideally I'd like to be able to switch profiles and have everything in the IDE working nicely 😄