PR: Add FAQ question about installing Spyder on WSL2

[hyamanieu]

Pull Request

Pull Request Checklist

• [x] Read and followed this repo's Contributing Guidelines
• [x] Based your PR on the latest version of the correct branch (master or 4.x)
• [x] Checked your writing carefully for correct English spelling, grammar, etc
• [x] Described your changes and the motivation for them below
• [x] Noted what issue(s) this pull request resolves, creating one if needed

Description of Changes

Added information on how to set up a WSL2 virtual machine for working on code using Windows Spyder but running kernels and modifying code on Linux.

Thanks to @CAM-Gerlach for the additional inputs.

Issue(s) Resolved

Fixes #297

[CAM-Gerlach]

Marking this as draft as a reminder to us to squash-merge this PR as discussed earlier to simplify the commit history and a potential backport.

[CAM-Gerlach]

Hey @hyamanieu , since @juanis2112 isn't able to review this, I guess we'll go ahead and merge it. Thanks again for all your work!