Confused about pseudo-elements in 5.0

[jessephillips]

I was confused about how to use FontAwesome icons in 5.0. I eventually figured it out, but I think this (or something like it) would be a helpful addition to the docs (note: this is my first time ever making a suggested change to a public repo. I apologize if this is foolish or rude or something).

My suggested change to README.md:

CSS Pseudo Element Usage (:before/:after)

(See FontAwesome docs for more details on pseudo-elements)

4.x Syntax

&:before {
  font-family: "FontAwesome";
  content: "\f058"; // check-circle
}

5.x Syntax

• The font-family is Font Awesome 5 Free
• Use font-weight: 900 for solid icons

&:before {
  font-family: "Font Awesome 5 Free";
  font-weight: 900;
  content: "\f058";
}

[plindelauf]

This SHOULD be in the docs!