Add agent skill for Microsoft Store CLI (msstore)

Author: alvinashcraft

docs/README.skills.md

@@ -148,6 +148,7 @@ See [CONTRIBUTING.md](../CONTRIBUTING.md#adding-skills) for guidelines on how to
 | [microsoft-skill-creator](../skills/microsoft-skill-creator/SKILL.md) | Create agent skills for Microsoft technologies using Learn MCP tools. Use when users want to create a skill that teaches agents about any Microsoft technology, library, framework, or service (Azure, .NET, M365, VS Code, Bicep, etc.). Investigates topics deeply, then generates a hybrid skill storing essential knowledge locally while enabling dynamic deeper investigation. | `references/skill-templates.md` |
 | [mkdocs-translations](../skills/mkdocs-translations/SKILL.md) | Generate a language translation for a mkdocs documentation stack. | None |
 | [model-recommendation](../skills/model-recommendation/SKILL.md) | Analyze chatmode or prompt files and recommend optimal AI models based on task complexity, required capabilities, and cost-efficiency | None |
+| [msstore-cli](../skills/msstore-cli/SKILL.md) | 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. | None |
 | [multi-stage-dockerfile](../skills/multi-stage-dockerfile/SKILL.md) | Create optimized multi-stage Dockerfiles for any language or framework | None |
 | [my-issues](../skills/my-issues/SKILL.md) | List my issues in the current repository | None |
 | [my-pull-requests](../skills/my-pull-requests/SKILL.md) | List my pull requests in the current repository | None |