Put 'missing godot sdk' error fix guide on the "Compiling for Windows" page

[FireBrandMint]

Your Redot version:

4.3

Issue description:

For years I've been having an issue where I build Godot mono with double precision but nuget never recognises the sdk packages.

Well, I got hacked so I had to build everything over again in a fresh Windows install, and this time I used Redot source.

And I found the problem after having to deal with it again! For whatever reason when I built all the necessary things Redot extracted all the godot sdks to %appdata%/NuGet

So I added the roaming folder of nuget by typing dotnet nuget add source %appdata%\Roaming\NuGet on the console and it worked.

TL;DR: Add dotnet nuget add source %appdata%\Roaming\NuGet as a possible solution to Error MSB4236: The SDK 'Godot.NET.Sdk/VERSIONHERE' specified could not be found. in builds from source.

URL to the documentation page (if already existing):

https://docs.redotengine.org/en/stable/contributing/development/compiling/compiling_for_windows