Updated README to use markdown

Author: Jason Moon

README

@@ -0,0 +1,13 @@
+# Cross-Domain AJAX for IE8
+
+Implements automatic *Cross Origin Resource Sharing* support using the `XDomainRequest` object for IE8 and IE9 when using the [ajax](http://api.jquery.com/jQuery.ajax/) function in jQuery 1.5+.
+> **CORS** requires the `Access-Control-Allow-Origin` header to be present in the AJAX response from the server.
+
+In order to use XDomainRequest in Internet Explorer, the request must be:
+- asynchronous
+- GET or POST
+- HTTP or HTTPS
+- same scheme as calling page
+
+Working example here:
+http://jsfiddle.net/MoonScript/Q7bVG/