Migrate David+Copilot's rewrite of instructions from Aspire

[adegeo]

In the Aspire repo, David used copilot to rewrite the instructions file in way that copilot feels is the best. This PR ports those instructions and tunes it slightly for this repo.

---

Internal previews

📄 File	🔗 Preview link
.github/copilot-instructions.md	.NET Documentation Guidelines

[BillWagner]

This looks really good. I have a few specific suggestions for folder-specific actions.

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The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 issues. Other issues are also a high priority. 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 issues. Other issues are also a high priority. 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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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.