putting github page for the src

community/index.html

@@ -7,7 +7,7 @@
 
 <h3 id="soucre-code">Source code</h3>
 
-<a href="http://git-wip-us.apache.org/repos/asf/incubator-crail.git">http://git-wip-us.apache.org/repos/asf/incubator-crail.git</a>
+The versioned source code history is available from the Apache git repository at <a href="http://git-wip-us.apache.org/repos/asf/incubator-crail.git">http://git-wip-us.apache.org/repos/asf/incubator-crail.git</a> or from the github mirror <a href="https://github.com/apache/incubator-crail">https://github.com/apache/incubator-crail</a>
 
 <h3 id="bug-tracking">Bug tracking</h3>