Explain auto discovery for normal users

[Nyholm]

We have a page describing auto discovery for library developers. I get the feeling that this page is not targeting the end developer, the one that is using the auto discovery service.

I think I'm missing a page that says:

To make everything work our of the box you need Puli. Install Puli like this... If you get an error like "no factories" you need to install http-php/message ... etc etc.

Related to https://github.com/florianv/swap/pull/26/files#r55143439

[Nyholm]

Also related: Happyr/LinkedIn-API-client#98