Update README.md

Link to online demo

Author: alexeyfridman

README.md

@@ -9,8 +9,11 @@ Features demonstration in 5 min (click to see on [YouTube](https://www.youtube.c
 
 [![UTBot C/C++ Demo](https://img.youtube.com/vi/bDJyWEeYhvk/0.jpg)](https://www.youtube.com/watch?v=bDJyWEeYhvk "UTBot C/C++ Demo")
 
+### Try online demo here: https://www.utbot.org/utbot
+
 More info on [wiki](https://github.com/UnitTestBot/UTBotCpp/wiki)
 
+
 ## How to install and use UTBot
 
 For now, you can only use UTBot under Ubuntu 18.04 and above.