add link to online page

README.md

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 Written in JavaScript and transaltes Oberon to JavaScript code so it can be run in web browser.
 
 ## Quick start
-run build.cmd (Python 2.x or 3.x is required). It will make _out/os.js and _out/oberonjs.html. Open oberonjs.html in the browser and try the compiler!
+You can try the compiler online [here](http://oberspace.dyndns.org/oberonjs.html).
+
+To build it locally run build.cmd (Python 2.x or 3.x is required). It will make _out/os.js and _out/oberonjs.html. Open oberonjs.html in the browser and try the compiler!
+