[readme][s]: convert to rst so it displays nicely and add a bit more …

…info about CKAN and more links.

README.rst

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+CKAN is open-source data hub software. CKAN makes it easy to publish, share and
+work with data. It's a data management system that provides a powerful platform
+for cataloging, storing and accessing datasets with a rich front-end, full API
+(for both data and catalog), visualization tools and more. Read more at
+http://ckan.org/. 
+
+ * Installation instructions: see docs at http://docs.ckan.org/
+ * Project wiki: http://wiki.ckan.org/
+ * Developer mailing list: ckan-dev@lists.okfn.org
+ * Issue tracker: http://trac.ckan.org/
+
+
+Copying and License
+===================
+
+This material is copyright (c) 2006-2011 Open Knowledge Foundation.
+
+It is open and licensed under the GNU Affero General Public License (AGPL) v3.0
+whose full text may be found at:
+
+http://www.fsf.org/licensing/licenses/agpl-3.0.html
+