Write a intro guide to DI/CDI for Protean

[emmanuelbernard]

Emmanuel:
Is it in the pipe to write a DI guide for Protean? I think a 2/3 pages doc with the most important aspects (@Inject, the scopes) and what is not supported would be useful to explain Protean. Right know you have to copy past example or know CDI to do things.

Martin Kouba: sure, could you pls create a github issue and assign it to me? thx
there's also https://github.com/jbossas/protean-shamrock/blob/master/ext/arc/README.md