Add section about adding deno to windows shell

[rosenbjerg]

I can update the example given to use the long form of the docker arguments, if that is preferred. I have tested the approach with deno run -A -r https://fresh.deno.dev my-app successfully.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[rosenbjerg]

I do not wish to grant cla-assistant write access to any of my stuff:

You are however free to use this contribution, and I'll gladly sign a CLA in another way that doesn't require that SAP SE gains write access to anything