Update README with image

Author: optiroot

README.md

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 UrlHum is a modern, privacy-aware and fast URL Shortener built with PHP and the Laravel Framework. 
 At the moment UrlHum is heavily under development, so we recommend you to don't use it in production.
 
+![UrlHum Screenshot](https://urlhum.com/dist/images/urlhum-screen.png)
+
 # What are UrlHum features?
 UrlHum provides you advanced privacy-oriented options, such as IP hashing and anonymizing. More, you control pretty anything from the admin panel: you can decide if an unauthenticated user must be able to create a Short URL, if disallowing certain Short URLs from being created and so much more!