We need expose the reference to Ember Engines here

[villander]

Engines are isolated, composable applications. They have almost all the same features as normal Ember applications.

The main reason to use engines is when you’re part of a large organization with many teams all contributing to one big application. Engines lets each team have their own area that is clearly separated from the others.

I think it is super important to link ember engines with ember guides, this will increase our visibility and the actual proposal of ember engines in ember ecosystem.

I think that best place is put this on "Application Concerns"

cc: @dgeb @jenweber

[villander]

Thanks @jenweber for following this ; )