Docstring for tunnel2jupyera added

small_useful_scripts/tunnel2jupytera.sh

@@ -1,5 +1,8 @@
 #!/bin/bash
 
+### Small script to create an SSH tunnel from outside of PSI network to access RA.
+### Change to your PSI account username and run. Once running, going to https://localhost:5000 leads to jupyera.psi.ch without needing VPN.
+
 def_user=$USER
 def_addr="jupytera"
 def_port="5000"