add Demo by Urs to README.md

Author: SimLi1333

README.md

@@ -95,7 +95,8 @@ The ConditionalRunner leverages Python's built-in logging system to provide insi
 
 ## Demo
 
-Three short demos can be found in the [demo/demo.py](demo/demo.py) file.
+There is a nice, extensive demo [`nornir-conditional-runner-demo`](https://github.com/InfrastructureAsCode-ch/nornir_conditional_runner_demo) done with NetLab by [`Urs Baumann`](https://github.com/ubaumann).
+Or there are short demos, which can be found in the [demo/demo.py](demo/demo.py) file.
 
 Demo topology with conditional groups: