SSDM-8127: Add hint for debugging Jupyter

README.md

@@ -102,6 +102,12 @@ After the setup is complete, you'll have
 * openBIS running at <https://localhost:8122/openbis/>, with credentials admin/password.
 * Object /DEFAULT/DEFAULT with a lot of datasets for testing.
 
+Hint: Jupyter creates no log file. Everything is printed onto the console. In order to see this output do the following:
+1. vagrant ssh
+2. screen -r
+
+You can escape from the screen by typing ^A followed by ^D. 
+
 
 ### clone repository and install extension for development