Install the Font Awesome npm package

npm install font-awesome --save

In the .angular-cli.json file you have to add the reference to the font-awesome.css that you just installed:

	"styles": [

In your pages you can reference the icons, e.g.:

<a href="" target="_blank"><i class="fa fa-twitter fa-2x menu-icon" aria-hidden="true"></i></a>

with the following result:

Here the list of the available icons