10 Responsive user list

[mwarman]

📢 Instructions

• Begin with a DRAFT pull request.
• Follow italicized instructions to add detail to assist the reviewers.
• After completing all checklist items, change the pull request to READY.

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🔧 Change Summary

List the changes included in this pull request.

• Issue: User list cards #10
• When viewport size >= medium, display the list of users as a grid of cards.
• When the viewport size is < medium, display the list of users as a list of items.

📝 Checklist

Pull request authors must complete the following tasks before marking the PR as ready to review.

• Complete a self-review of changes
• Unit tests have been created or updated
• The code is free of [new] lint errors and warnings

🧪 Steps to Test

Describe the process to test the changes in this pull request.

1. Test in the browser at all viewport sizes.
2. Test with the browser mobile emulator.
3. No lint messages
4. All tests passing.

🔗 Additional Information

Optionally, provide additional details, screenshots, or URLs that may assist the reviewer.

• ...