Add agent skill for Microsoft Store CLI (msstore)

[alvinashcraft]

Pull Request Checklist

• I have read and followed the CONTRIBUTING.md guidelines.
• My contribution adds a new instruction, prompt, agent, skill, or workflow file in the correct directory.
• The file follows the required naming convention.
• The content is clearly structured and follows the example format.
• I have tested my instructions, prompt, agent, skill, or workflow with GitHub Copilot.
• I have run npm start and verified that README.md is up to date.

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Description

Microsoft Store Developer CLI (msstore) for publishing Windows applications to the Microsoft Store. Use when asked to configure Store credentials, list Store apps, check submission status, publish submissions, manage package flights, set up CI/CD for Store publishing, or integrate with Partner Center. Supports Windows App SDK/WinUI, UWP, .NET MAUI, Flutter, Electron, React Native, and PWA applications.

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Type of Contribution

• New instruction file.
• New prompt file.
• New agent file.
• New plugin.
• New skill file.
• New agentic workflow.
• Update to existing instruction, prompt, agent, plugin, skill, or workflow.
• Other (please specify):

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Additional Notes

The Microsoft Store CLI repo is available here.

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By submitting this pull request, I confirm that my contribution abides by the Code of Conduct and will be licensed under the MIT License.

[Copilot]

Pull request overview

Adds a new Agent Skill documenting how to use the Microsoft Store Developer CLI (msstore) for Store credential setup, app/submission management, packaging, publishing, flights, and CI/CD integration, and registers it in the skills index.

Changes:

• Added msstore-cli skill documentation with command reference, workflows, troubleshooting, and links to official resources.
• Updated the skills catalog to include the new msstore-cli entry.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
skills/msstore-cli/SKILL.md	New skill content covering msstore CLI usage patterns and common workflows.
docs/README.skills.md	Adds the msstore-cli skill to the skills listing table.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.