Update STYLE.md

[cooper-mj]

Added a note on italics - I think we need something to indicate the introduction of new terms and definitions, and I propose it to be italic text.

[parthsarin]

I think it should be quotes – works better for screen readers

[parthsarin]

A quick Google search yields:

Short answer? No. By default, screen readers do not distinguish between regular text and italic text (or bold text, for that matter). Additionally, it will not distinguish the use of <strong> and <em> either.

(From Quora)

OTOH, some screen readers read quotes:

Symbol	The character by itself	In Context	JAWS 15	NVDA	VoiceOver
double quotation mark	“	I feel “fine,” she said, sarcastically.	By itself: “quote” In context: “I feel quote fine quote she said sarcastically”	By itself: nothing In context: nothing	By itself: “quote” In context: VoiceOver pauses but does not say “quote”

(Excerpted from Screen Readers: A Guide to Punctuation and Typographic Symbols)