[WIP] Update README files to include Contributors section

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original prompt

Update all README files in the msftsean/ai-hackathon-use-cases repository to add a Contributors section near the end of each file. The Contributors section should include the following:

👥 Contributors

• Sean Gayle (@msftsean)

Add this section if it does not exist. If a Contributors section already exists, ensure it lists Sean Gayle with the correct GitHub handle. This change should be made to all primary README files in the root and major subdirectories (including but not limited to: README.md, Emergency-Response-Agent/README.md, Document-Eligibility-Agent/README.md, Virtual-Citizen-Assistant/README.md, Policy-Compliance-Checker/README.md, DotNet-Virtual-Citizen-Assistant/README.md).

This pull request was created as a result of the following prompt from Copilot chat.

Update all README files in the msftsean/ai-hackathon-use-cases repository to add a Contributors section near the end of each file. The Contributors section should include the following:

👥 Contributors

• Sean Gayle (@msftsean)

Add this section if it does not exist. If a Contributors section already exists, ensure it lists Sean Gayle with the correct GitHub handle. This change should be made to all primary README files in the root and major subdirectories (including but not limited to: README.md, Emergency-Response-Agent/README.md, Document-Eligibility-Agent/README.md, Virtual-Citizen-Assistant/README.md, Policy-Compliance-Checker/README.md, DotNet-Virtual-Citizen-Assistant/README.md).

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