Added intial README

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+This plugin enables RSSCloud (http://rsscloud.org/) publishing and
+subscription handling for RSS 2.0 profile feeds (i.e:
+http://SITE/PATH/api/statuses/user_timeline/USERNAME.rss). When the
+plugin is enabled, StatusNet acts as both the publisher and hub ('writer' and
+'cloud' in RSSCloud parlance), but only for local StatusNet feeds. It's
+not possible to use it as a general purpose hub -- for instance you can't
+subscribe and get updates to a Wordpress feed from StatusNet.
+
+To use the plugin, add the following to your config.php:
+
+    addPlugin('RSSCloud');
+
+Enabling the plugin will add a <cloud> element to your RSS 2.0 profile feeds
+that looks like this:
+
+    <cloud domain="SITE" port="80" path="/main/rsscloud/request_notify"
+    registerProcedure="" protocol="http-post"/>
+
+Aggregators may subscribe by sending a proper REST RSSCloud subscription
+request (the optional 'domain' parameter with challenge is supported).
+Subscribing aggregators will be notified ('pinged') when users they have
+subscribed to post new notices. Currently, REST is the only protocol
+supported for notifications.
+
+Deamon
+------
+
+There's also a daemon for offline processing of queued notices with
+RSSCloud destinations, which will start automatically if/when you run
+scripts/startdaemons.sh.
+
+Notes
+-----
+
+- Again, only RSS 2.0 profile feeds may be subscribed to, and they have
+  be the ones with user names in them, like:
+      http://SITE/PATH/api/statuses/user_timeline/USERNAME.rss
+- Subscriptions are deleted after three notification failures in a row
+  (not sure this is optimal).
+- The plugin includes a dummy LoggingAggregator class that can be used
+  for end-to-end testing.  You probably don't want to mess with it.
+
+TODO
+----
+
+- Figure out why the RSSCloudSubcription can't ->delete() or ->update()
+- Support pinging via XML-RPC and SOAP
+- Automatically delete subscriptions? Point of reference: Dave's hub
+  implementation auto-deletes them after 25 hours. WordPress never deletes them.
+- Support additional feed URL addresses for the same feed (e.g.: by numeric ID,
+  ?user_id=xxx, etc.)
+- Support additional feeds that make sense (e.g: replies)?
+- Possibly use "rssCloud" (like Dave) instead of "RSSCloud" everywhere