Draft: Add a reference to the HPC expert

Closes #634

doc.zih.tu-dresden.de/docs/support/support.md

 # User Support
 
+## Ask the HPC Buddy
+
+Our colleagues from ScaDS.AI have created the [HPC Buddy](https://hpcexpert.zih.tu-dresden.de), an
+AI that tries to answer your questions using knowledge from this documentation. It is updated
+regularly, but not always accurate, as it has no real understanding of this documentation. However,
+it provides sources, so you may try it out before you consider the steps mentioned below.
+
+!!! warning "Correctness"
+
+    Note that the HPC Buddy does not really understand your requests. While it tries to give you
+    the sources for its statements, it is not always correct even when it sounds convincing.
+
 ## Create a Ticket
 
-The best way to ask for help send a message to
+The best way to ask for help: send a message to
 [hpc-support@tu-dresden.de](mailto:hpc-support@tu-dresden.de) with a
 detailed description of your problem.