Add a USB mass storage example for AVR

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3727 42af7a65-404d-4744-a932-0658087f49c3

Documentation/NuttX.html

@@ -8,7 +8,7 @@
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       <h1><big><font color="#3c34ec"><i>NuttX RTOS</i></font></big></h1>
-      <p>Last Updated: June 16, 2011</p>
+      <p>Last Updated: June 20, 2011</p>
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@@ -1577,6 +1577,11 @@
          simplified NuttShell (NSH) configuration (see the
          <a href="http://www.nuttx.org/NuttShell.html">NSH User Guide</a>).
       </p>
+      <p>
+         An SPI driver and a USB device driver exist for the AT90USB (as well
+         as a USB mass storage example).  However, this configuration is not
+         fully debugged as of the NuttX-6.5 release.
+      </p>
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