Is there any guide on how to add nebular into an exisiting 12 angular app

[niiwade]

Issue type

I'm submitting a ... (check one with "x")

• [x] bug report
• [x] feature request

Issue description

Current behavior:

Expected behavior:

Steps to reproduce:

Related code:

insert short code snippets here

Other information:

npm, node, OS, Browser

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Angular, Nebular

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[giacomo]

https://akveo.github.io/nebular/docs/guides/install-nebular#install-nebular