doc: Add guide for dev setup on Windows

This adds a step-by-step guide to install a dev setup based on
WSL2 / Ubuntu and native VS Code with the WSL extension. The guide
uses screenshots and adds annotations on top using Inkscape, so that
every click is documented.

The Inkscape sources are also added to allow adjusting / fixing the
annotations later on without having to record a new set of screenshots.

Co-authored-by: Dylan Laduranty <dylan.laduranty@mesotic.com>

README.md

@@ -117,6 +117,11 @@ For specific toolchain installation, follow instructions in the
   version of the documentation is uploaded daily to
   [doc.riot-os.org](https://doc.riot-os.org).
 
+Using Windows? Use [this guide][dev-setup-windows] to
+[setup the development environment][dev-setup-windows].
+
+[dev-setup-windows]: doc/guides/setup-windows
+
 ## Forum
 Do you have a question, want to discuss a new feature, or just want to present
 your latest project using RIOT? Come over to our [forum] and post to your hearts

doc/doxygen/src/getting-started.md

@@ -34,7 +34,12 @@ will also be fine - however, we rely on users to report bugs regarding tooling i
 here. So expect occasional issues for the development branch and please help testing during the
 feature freeze period, if you develop on macOS or BSD.
 
-Native development on Windows and macOS machines is not officially supported. What works well is using Linux
+Windows users can refer to [this guide][dev-setup-windows] to
+[setup the development environment][dev-setup-windows] on Windows.
+
+[dev-setup-windows]: doc/guides/setup-windows
+
+Native development on macOS machines is not officially supported. What works well is using Linux
 in a virtual machine, but at much lower performance than running Linux natively. We also offer Docker images.
 For development on Windows, using the
 [Windows Subsystem for Linux (WSL)](https://en.wikipedia.org/wiki/Windows_Subsystem_for_Linux)