Updated README.md with links to spec etc

Author: adamretter

README.md

@@ -1,4 +1,23 @@
-csv-schema
+CSV Schema
 ==========
 
-CSV Schema
+A Schema Language for CSV (Comma Separated Value) files.
+
+This repository holds the code for creating the CSV Schema specification document, which
+is then published as HTML. The Schema language is formally expressed in EBNF.
+
+You can find the the documentation and latest published specification here:
+	http://digital-preservation.github.io/csv-schema.
+
+
+Repository Organisation
+-----------------------
+* `master` branch holds the source code for producing the specification.
+
+* `gh-pages` holds the documentation and copies of each published version of the specification.
+
+* There is one tag from master each time a version of the specification is published. The tag name reflects
+the specification version number.
+
+
+Released under the [Mozilla Public Licence version 2.0](http://www.mozilla.org/MPL/2.0/).