Add new WINE.md help file

Slow and not 100% reliable but still very useful to quickly test
Pathlib and other issues without juggling with multiple systems.

Author: marc-hb

WINE.md

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+https://www.winehq.org/ provides a way to run Windows binaries on Linux.
+
+Q: Why would a west developer need WINE considering west is portable Python code?
+A: To quickly put themselves in the shoes of Windows users and troubleshoot
+   Windows-specific issues without:
+
+- A Windows licence
+- A different computer to run it, or the inconvenience of dual-booting
+- The inconvenience of synchronizing source files across computers
+
+Warning: WINE is not 100% identical to Windows and WINE is _not_ able to replicate all
+issues happening on Windows. But enough issues can be reproduced, including Path-related
+issues.
+
+This is a quick and dirty recipe to run west tests using WINE.  This process is not
+officially supported and these instructions can "bitrot" and may have fallen apart by the
+time you read them: you have been warned. Please submit fixes or better ways if you know
+them. If humanly possible, keep this working over ssh. That is: without any GUI.
+
+Do NOT replace Windows by WINE to validate releases!
+
+```
+# wenv seems to work and to simplify things
+# https://wenv.readthedocs.io/en/latest/usage.html
+pip install wenv
+export WENV_PYTHONVERSION=3.12.10 # or any other version that works
+wenv init
+# wenv help should now list "3.12"
+wenv help
+# Warning: pykwalify is being replaced by jsonschema, see #904 and west/pyproject.toml
+wenv pip -v install setuptools
+wenv pip -v install pyyaml pykwalify pytest pytest-xdist pytest-env
+```
+
+An alternative to WENV_PYTHONVERSION is:
+```
+echo '{ "pythonversion": "3.12.10" }' > ~/.wenv.json
+```
+
+Download MinGit-*-32bit.zip from https://github.com/git-for-windows/git/releases/
+```
+unzip -d ~/.local/share/wenv/win32/drive_c/MinGit  MinGit-*-32-bit.zip
+```
+
+Append this at the end of `west/pyproject.toml`
+
+```
+# TODO: find a way to do this in "wenv" instead
+# Useful tip: pytest --pytest-env-verbose ...
+[tool.pytest_env]
+PATH = { value = "{PATH};C:\\MinGit\\cmd", transform = true }
+```
+
+At last:
+```
+cd west
+wenv pytest -h
+wenv pytest -v -s -k round_trip -n auto
+
+# Deletes pretty much everything for the current $WENV_PYTHONVERSION and reclaims
+# a couple Gigabytes
+wenv clean
+```
+
+