Added readme content, badges and links

README.md

@@ -1,2 +1,14 @@
-# mantle-udm
-Mantle Universal Data Model
+## Mantle Business Artifacts - Universal Data Model
+
+[![license](http://img.shields.io/badge/license-CC0%201.0%20Universal-blue.svg)](https://github.com/moqui/mantle-udm/blob/master/LICENSE.md)
+[![release](http://img.shields.io/github/release/moqui/mantle-udm.svg)](https://github.com/moqui/mantle-udm/releases)
+[![commits since release](http://img.shields.io/github/commits-since/moqui/mantle-udm/v1.0.0.svg)](https://github.com/moqui/mantle-udm/commits/master)
+[![downloads](http://img.shields.io/github/downloads/moqui/mantle-udm/total.svg)](https://github.com/moqui/mantle-udm/releases)
+
+For details about Mantle see its page on moqui.org:
+
+<http://www.moqui.org/mantle.html>
+
+There is an overview of the Universal Data Model in the **Making Apps with Moqui** book. Download the PDF here:
+
+<http://www.moqui.org/MakingAppsWithMoqui-1.0.pdf>