[Adrianogba]

Description

The stable plugins table still lists App Check as N/A on Windows. Windows support shipped in firebase_app_check 0.4.3 (#18140), and the other Windows C++ plugins in that table (Authentication, Cloud Firestore, Cloud Storage, Core, and Remote Config) are marked (*): development only, with production unsupported.

This changes the App Check Windows cell from N/A to (*).

Related Issues

Fixes #18913

Checklist

Before you create this PR confirm that it meets all requirements listed below by checking the relevant checkboxes ([x]).
This will ensure a smooth and quick review process. Updating the pubspec.yaml and changelogs is not required.

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• My PR includes unit or integration tests for all changed/updated/fixed behaviors (See Contributor Guide).
• All existing and new tests are passing.
• I updated/added relevant documentation (doc comments with ///).
• The analyzer (melos run analyze) does not report any problems on my PR.
• I read and followed the Flutter Style Guide.
• I signed the CLA.
• I am willing to follow-up on review comments in a timely manner.

Breaking Change

Does your PR require plugin users to manually update their apps to accommodate your change?

• Yes, this is a breaking change.
• No, this is not a breaking change.

Test plan

• The App Check row in the README stable plugins table shows (*) under Windows, and the footnote under the table is unchanged.

[gemini-code-assist]

Code Review

This pull request updates the README.md file to reflect that Windows support for App Check is now available under certain conditions, changing its status from 'N/A' to '(*)'. There are no review comments, and I have no additional feedback to provide.