Create jsx.js

added JSX (XML-like syntax extension to ECMAScript) for React
as specified at https://facebook.github.io/jsx/

j/jsx.js

@@ -0,0 +1,12 @@
+var React = require('react');
+
+var HelloWorld = React.createClass({
+    displayName: 'HelloWorld',
+    render: function() {
+        return (
+            <span>Hello World</span>
+        );
+    }
+});
+
+console.log(React.renderToString(<HelloWorld />));