Initial user for musicjungle

I'm sending this PR for 2 reasons:

(1) not the most important, but it's incredibly annoying run manual tests on 
jungle (because we need to create the user each time the server is restarted)

(2) It's a observer example, linking to our docs, et cetera. 
because the request context might not be active
but we can inject EMF (app scoped). I'm changing it now