docs: add global lib usage instructions

[filipesilva]

See #6033 for context.

[dave11mj]

Would it be worth mentioning you have to add the types to tsconfig.json ? specially one like jQuery where you explicitly install them using npm install @types/jquery ... In my applications I just add jquery to tsconfig.app.json. Sneaking a links to this docs covers what I was mentioning about adding types to tsconfig after installing them. https://github.com/angular/angular-cli/blob/master/docs/documentation/stories/third-party-lib.md

Might also be worth mentioning interfacing jQuery or other libraries as a nice technique to add additional methods that are not part of the jquery core / typings installed.

[hansl]

LGTM

[filipesilva]

@dave11mj that's a good point, would you be interested in making a followup PR as this one has already been merged?

[dave11mj]

ok !

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