use font awesome in css file code example

Example 1: how to import fontawesome

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">

Example 2: install font awesome

npm install --save @fortawesome/fontawesome-free
$fa-font-path:        "../webfonts";
@import "~@fortawesome/fontawesome-free/scss/fontawesome.scss";
@import "~@fortawesome/fontawesome-free/scss/solid.scss";
@import "~@fortawesome/fontawesome-free/scss/brands.scss";
@import "~@fortawesome/fontawesome-free/scss/regular.scss";
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