Added license to readme

Author: leongersen

README.md

@@ -5,7 +5,11 @@ wNumb - JavaScript Number & Money formatting
 
 # Documentation
 
-Documentation and examples are available on (refreshless.com/wnumb)[http://refreshless.com/wnumb/).
+Documentation and examples are available on [refreshless.com/wnumb](http://refreshless.com/wnumb/).
+
+# License
+
+Licensed [WTFPL](http://www.wtfpl.net/about/), so free for personal and commercial use.
 
 # Compression