Tools: firmware.diydrones gets reference to companion computers

Tools/autotest/web-firmware/index.html

@@ -89,7 +89,9 @@ The software and hardware we provide is only for use in unmanned
 <a href="Tools"><img src="images/tools.png" width="80"
 		     alt="Tools">Tools</a> - Build and development tools<p>
 <a href="devbuild"><img src="images/tools.png" width="80"
-		     alt="Tools">DevBuild</a> - Developer builds<p>
+		     alt="Tools">DevBuild</a> - Developer builds<p> 
+<a href="http://github.com/diydrones/companion"><img src="images/companion.png" width="78" 
+             alt="Companion">Companion</a> - Companion Computer example code</p><p>
 
 <h2>Types of firmware available</h2>