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/api-python-client-doc/README b/samples/api-python-client-doc/README
index 835a60c..bcbf475 100644
--- a/samples/api-python-client-doc/README
+++ b/samples/api-python-client-doc/README
@@ -1,6 +1,5 @@
-This sample is the code that drives
+This sample is the code that drives http://api-python-client-doc.appspot.com/
+It is an application that serves up the Python help documentation for each API.
 
-   http://api-python-client-doc.appspot.com/
-
-It is an application that serves up the Python help documentation
-for each API.
+api: discovery
+keywords: appengine