Add mermaid diagram of repo folders

[sdwheeler]

PR Summary

Add mermaid diagram of repo folders

PR Checklist

• Descriptive Title: This PR's title is a synopsis of the changes it proposes.
• Summary: This PR's summary describes the scope and intent of the change.
• Contributor's Guide: I have read the contributor's guide.
• Style: This PR adheres to the style guide.

[Copilot]

Pull request overview

Replaces the bulleted folder listing in README.md with a Mermaid treeView-beta diagram of the repository structure, and updates the ms.date front matter. The folder list is also extended to include the new 7.7 reference folder.

Changes:

• Convert the "Repository Structure" bullet list to a Mermaid treeView-beta diagram with emojis and inline descriptions.
• Add 7.7 to the listed PowerShell reference folders.
• Bump ms.date to 05/13/2026 and drop the now-unused [01] link reference.

Comments suppressed due to low confidence (1)

README.md:40

• This line starts with a stray replacement character (�) immediately before the 📦 emoji. Remove the leftover invalid character so only the intended emoji is displayed.

        "�📦 assets - Downloadable files linked in documentation"

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[learn-build-service-prod]

Learn Build status updates of commit 639d3fa:

✅ Validation status: passed

File	Status	Preview URL	Details
README.md	✅Succeeded

For more details, please refer to the build report.

[learn-build-service-prod]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 and severity-2 issues. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

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[learn-build-service-prod]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 and severity-2 issues. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

✅ No issues found

More information about PoliCheck

Information: PoliCheck | Severity Guidance | Term
For any questions: Try searching the learn.microsoft.com contributor guides or post your question in the Learn support channel.

[learn-build-service-prod]

Learn Build status updates of commit c992da1:

✅ Validation status: passed

File	Status	Preview URL	Details
README.md	✅Succeeded

For more details, please refer to the build report.