+Subscribe to a website/feed
+===========================
+Phinde supports WebSub__ to get subscribe to changes of a website.
+When phinde gets notified by the website's hub about changes,
+it will immediately crawl and index the changed pages.
+
+Subscribe to a website's feed::
+
+ $ php bin/subscribe.php http://example.org/feed.atom
+
+Phinde will determine the website's hub and send a registration request to it.
+
+The status page will show the number of working, and the number of open
+subscriptions.
+
+Unsubscribing also happens on command line::
+
+ $ php bin/unsubscribe.php http://example.org/feed.atom
+
+__ https://www.w3.org/TR/websub/
+