doc-2.1: Getting dependencies (new page)

Draft of a new chapter of documentation that discusses possibilities of getting dependencies into application classes and provides a list of examples on various types of injections for presenters, components and services.

The page will be further extended to contain some specific cases, like presenters or component factories registered in the DI Container.

This draft is currently only in Czech language, it will by translated after corrections and expansion.

Any feedback is welcome.