feat: add agent skills post by Daniel Diaz

[danieldiaz-qaa]

First post 🤓

Covers Agent Skills in VS Code — what they are, how to structure a SKILL.md,
and how they fit into the broader Copilot customization ecosystem (instructions,
hooks, MCP, plugins).

References VS Code release notes 1.110 and 1.113 for accuracy.

First in a series on VS Code agent customizations.

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Note

Low Risk
Low risk: this PR only adds a new Markdown blog post and does not change application/runtime code paths.

Overview
Adds a new published post, posts/danieldiaz-qaa/1.agent-skills.md, introducing VS Code Copilot Agent Skills.

The article explains the .github/skills/<name>/SKILL.md structure (with a minimal example), how to create skills via /create-skill, and how skills fit into the broader Copilot customization ecosystem (instructions, hooks, MCP servers, plugins), with links and an overview image reference.

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[Copilot]

Pull request overview

Adds Daniel Diaz’s first DEV.to post introducing VS Code “Agent Skills” and how they fit into Copilot customization, including a minimal SKILL.md example and references to VS Code release notes.

Changes:

• New article describing Agent Skills, their repo layout, and practical usage via /create-skill.
• Includes a minimal SKILL.md template example and a customization ecosystem overview.
• Adds/uses local assets for header and an in-post diagram.

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[github-actions]

Dry-run output:

[CREATED] [DRAFT] I stopped fighting Copilot's conventions. I taught i…