update readme

README.md

@@ -284,5 +284,7 @@ Just add the dir="rtl" attribute to the input element
 <input id="test" dir="rtl" />
 ```
 
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+## Compiling with Google Closure Compiler
 
+First grab the sources from github.  In the root you type ant.
+A new folder dist is created with the minified and optimized js-files