docs(windows): document SDIO opt-in usage

[niStee]

What does this PR do

• add README guidance about SDIO driver updates and Windows support
• introduce an SDIO security/vulnerability assessment guide
• extend .gitignore to avoid committing SDIO-generated artifacts

Standards checklist

• The PR title is descriptive
• I have read \CONTRIBUTING.md\
• Optional: I have tested the code myself
• If this PR introduces new user-facing messages they are translated

For new steps

• Optional: Topgrade skips this step where needed
• Optional: The --dry-run\ option works with this step
• Optional: The --yes\ option works with this step if it is supported by
  the underlying command

Testing

• Documentation-only changes

Related PRs

• Split from Feat/windows-sdio-support #1269 (Feat/windows-sdio-support)