Automatically generate Samples wiki page from README files.

Reviewed in http://codereview.appspot.com/5900069/.

Index: samples-index.py
===================================================================
new file mode 100644
diff --git a/samples/gtaskqueue_sample/README b/samples/gtaskqueue_sample/README
index 6535127..f823db0 100644
--- a/samples/gtaskqueue_sample/README
+++ b/samples/gtaskqueue_sample/README
@@ -1,6 +1,9 @@
 This acts as a sample as well as commandline tool for accessing Google TaskQueue
 APIs.
 
+api: taskqueue
+keywords: cmdline
+
 Installation
 ============