Add a how-to for setting up conda on windows.

[JoeZiminski]

There are some weird things about setting up conda on windows that have caused problems for new users and are basically impossible to debug without a lot of googling. I think the beow should work for cmd but definately work for powershell.

1. Set the conda directory in environment variables so powershell can recognise it.
   https://stackoverflow.com/questions/44597662/conda-command-is-not-recognized-on-windows-10

2. Set the powershell permissions to allow conda to function

https://stackoverflow.com/questions/62082873/conda-not-activated-in-power-shell

3. conda init powershell

[JoeZiminski]

this has changed, the windows path should be set to condabin not scripts!