Document installing alternative packages

[weierophinney]

There is a feature to install alternative packages: Instead of entering one of the selection you can actually type the package name and version.

  Which template engine do you want to use?
  [1] Plates
  [2] Twig
  [3] zend-view installs zend-servicemanager
  [n] None of the above
  Make your selection or type a composer package name and version (n): infw/pug:0.1
  - Searching for infw/pug:0.1
  - Adding package infw/pug (0.1)

That feature has been there from the beginning and it allows you to install any alternative package you want. It has its limitations though:

• You need to enter the alternative package as namespace/package:1.0. It needs the version. I can't remember why I coded it like that, but I think it had to do with the way composer works or my limited composer api knowledge at that time :)
• Templates are not copied, but you can configure your ConfigProvider in such way that it uses the default templates directly from the package itself.
• This doesn't work for containers as the container.php file needs to be copied.

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Originally posted by @geerteltink at zendframework/zend-expressive-skeleton#267

[weierophinney]

Also start a list with 3rd party extensions that can be added this way.

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Originally posted by @geerteltink at zendframework/zend-expressive-skeleton#267 (comment)