add an FAQ entry about the logo and mascot

R=rsc
CC=golang-dev, reneefrench
https://golang.org/cl/157144

doc/go_faq.html

@@ -90,6 +90,21 @@ more than willing to answer questions and offer advice to anyone
 willing to develop a Windows version.
 </p>
 
+<h3 id="Whats_the_origin_of_the_mascot">
+What's the origin of the mascot?</h3>
+
+<p>
+The mascot and logo were designed by
+<a href="http://reneefrench.blogspot.com">Renée French</a>, who also designed
+<a href="http://plan9.bell-labs.com/plan9/glenda.html">Glenda</a>,
+the Plan 9 bunny.
+The gopher is derived from one she used for an <a href="http://wfmu.org/">WFMU</a>
+T-shirt design some years ago.
+The logo and mascot are covered by the
+<a href="http://creativecommons.org/licenses/by/3.0/">Creative Commons Attribution 3.0</a>
+license.
+</p>
+
 <h2 id="Usage">Usage</h2>
 
 <h3 id="Who_should_use_the_language">