[suggestion] setup section for Windows users

[ghb5d73f4]

For setting up the environment on Windows, alternatives exists (listed below without specific order):

• The docker image jupyter/scipy-notebook contains all the suggested software programs (bash, git, jupyterlab, nano, ...) and can be started as a ready-to-use environment. (Granted, if a user already uses Docker, they might not need the Carpentry course to start with, ...)
• The (proprietary yet free) MabXterm program for windows comes with a bash shell (derived from cygwin) with git installed and possibility to install nano. (No jupyter lab installation, thought).
• The windows package manager winget can install git, anaconda, ... from the windows command line easily (in the spirit of apt on Debian based Linux)
• Although it's mentioned later, WSL is a good option to run all softwares for the Carpentry course on a Windows computer, particularly now that WSL is available for easy installation from the Windows application store

(Comment applies to the setup recommendations for the global carpentry classes)