Doc change: add image for GDC 2011 announcement.

Change-Id: Ia7bac143a043a1f9c74de3be04a566371ad6dbe6
diff --git a/tools/droiddoc/templates-sdk/assets/images/home/GDC2011.png b/tools/droiddoc/templates-sdk/assets/images/home/GDC2011.png
new file mode 100644
index 0000000..82ce918
--- /dev/null
+++ b/tools/droiddoc/templates-sdk/assets/images/home/GDC2011.png
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