Add readme to batman.js app

architecture-examples/batmanjs/README.md

+# batman.js • [TodoMVC](http://todomvc.com)
+
+Batman.js is a framework for building rich web applications with CoffeeScript or JavaScript. App code is concise and declarative, thanks to a powerful system of view bindings and observable properties. The API is designed with developer and designer happiness as its first priority.
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+[Issue](https://github.com/addyosmani/todomvc/issues/14)
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