add share thingy

[shawna-slh]

@AndrewArch from w3c/wai-audiences#3 (comment)

@slhenry wrote "... that you might want to read now or later"
Suggest adding (strongly hinting) that they might like to share some of these other resources

/me thinks smoothest thing is to add a share thingy on the whole page.

Welcome other ideas, including specific wording for possible additional text.

[shawna-slh]

I added to the bottom of the all the role (fka audience) pages: "... or sharing with others."

We encourage you to look around the W3C WAI website to find other information that you might be interested in reading or sharing with others.