Document recommended project structure/architecture

[vmsp]

It would be great if the "right way" to do project structure with closure tools and java was documented and shown in an example project. This was already brought up in a tangential discussion in issue #77.

Thank you! I look forward to using bazel and closure!

[adam-rocska]

@vmsp The great thing about Bazel is, that it's not "opinionated", or whatever the trendy coined term is nowadays. Design your software however you please, and Bazel can handle it. Same for Closure.