Readme for Windows ambient

[grnmeira]

Please provide a description of this PR:

[istio-testing]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[grnmeira]

Waiting for #57005 and istio/ztunnel#1608

[istio-testing]

@grnmeira: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
lint_istio_exp	72f360a	link	true	/test lint
gencheck_istio_exp	72f360a	link	true	/test gencheck
integ-ambient-owned-cni_istio_exp	72f360a	link	false	/test integ-ambient-owned-cni

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[istio-policy-bot]

🚧 This issue or pull request has been closed due to not having had activity from an Istio team member since 2025-09-11. If you feel this issue or pull request deserves attention, please reopen the issue. Please see this wiki page for more information. Thank you for your contributions.

Created by the issue and PR lifecycle manager.