Added change avatar help

src/avatar/index.md

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+---
+title: Change Avatar
+---
+
+# How do I change my avatar?
+
+Game Jolt uses [Gravatar](http://gravatar.com/) to serve up the avatars on the site. If you don't have a Gravatar account, go set one up at [gravatar.com](http://gravatar.com/) using the same email address you use for Game Jolt. Then, upload your avatar image.
+
+After a sort delay, your avatar will start appearing on Game Jolt. If it doesn't show up after a while, try clearing your browser's cache.
+
+If you want to change your avatar again, upload a new image to Gravatar and associate it with the email address you use for Game Jolt.
+
+We recommend changing your avatar to something other than the default ninja (even though it's pretty cute). It's a simple thing to do and it makes you stand out from the crowd wherever your avatar appears, like on your game pages, next to your comments, and so on.