Package development: how to include provider and aliases (Socialite)

I'm developing my first Larvel-based package. I want to include the Socialite package, so I put it like this in my composer.json file

"require": {
    "laravel/socialite": "^2.0"
},

Now, how do I include the provider and the alias as you'd normally do in /config/app.php ?

I think by now I've read every stackoverflow there is about this matter, but nothing seems to work.

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