add VS Code Tunnel recommendations

Author: hajgato

config/templates/hpc.template

@@ -59,6 +59,7 @@ nav:
       - OpenFOAM: openFOAM.md
       - Python: python.md
       - Python virtual environments: setting_up_python_virtual_environments.md
+      - VS Code Tunnel: VScode.md
   - FAQ:
       - Frequently Asked Questions: FAQ.md
   - Appendices:

mkdocs/docs/HPC/VScode.md

@@ -0,0 +1,46 @@
+# VS Code Tunnel
+
+Please keep in mind, that this is not a VS Code manual,
+it is only our recommendation how to connect to the {{ hpcinfra }} using the VS code tunnel. 
+
+For VS Code documentation, see <https://code.visualstudio.com/docs>
+
+We only support VS Code tunnel access via the VS Code application (installed locally),
+since web access might not work from all browser or operational system.
+The only confirmed way to connect via a browser is using Windows 11 and Edge. 
+
+## Prerequisites
+
+We do recommend to install remote developent for the VS Code App.
+
+
+## Connection
+
+In the [web portal](./web_portal.md), under the "Interactive Apps" choose VS Code Tunnel,
+select the parameters and launch your job by clicking ++Launch"++
+When your job has started, connect by clicking ++"Connect"++
+
+In the new browser tab or window, for the question
+`How would you like to log in to Visual Studio Code?` choose `Microsoft Account` 
+(using the arrow keys on your keyboard, then hit ++"Enter"++).
+Then follow the instruction to authenticate yourself.
+If you get an error message something like "You do not have access to this"
+durng the Microsoft Authentication, then you might have to
+[whitelist yourself](https://dictselfservice.ugent.be/index.php?page=requestform&form=deviceCodeAuth)
+(You have to do it only once.)
+
+If you are not connected automatically to the tunnel, please select "connect to..." and then
+"Connet to Tunnel" using Microsoft Account and select the tunnel named `vsc-<your vsc account>-<cluster>`.
+Please note that right now you can only have one tunnel per cluster.
+
+If you are asked to update VS Code CLI on your remote server, choose ++"Not Now"++.
+You do not have permission to update the CLI, as it is centrally installed.
+This means that your VS Code App is newer than the CLI on our systems.
+We update the centrally installed CLI time to time,
+but the upgrade rate of the App/CLI is very high,
+so it is hard for us to follow it tightly.
+
+Please do not use VS Code to ssh to the login nodes,
+but always use a VS Code Tunnel conection,
+peferably using the [interactive and debug cluster](./interactive_debug.md) 
+