Add microsoft-skill-creator to README Agent Skills section

[Copilot]

Plan to Add microsoft-skill-creator to README

• Review the current README structure in the "Agent Skills" section
• Review the microsoft-skill-creator skill to understand its purpose
• Add microsoft-skill-creator to the skills table in README
• Update "two skills" to "three skills" in introduction
• Add microsoft-skill-creator to Quick Setup instructions
• Add microsoft-skill-creator to "Which Skill Do I Need?" table
• Verify the changes are correct and minimal (validation passed)
• Run code review to ensure quality (no issues found)
• Run security checks (no vulnerabilities - documentation only)
• Improve wording to clarify it's a meta-skill that generates other skills

Original prompt

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This section details on the original issue you should resolve

<issue_title>[bug] the newly added microsoft-skill-creator skill is not listed in README agent skills section</issue_title>
<issue_description>microsoft-skill-creator skill was added under skills folder, but it is not mentioned in README.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [bug] the newly added microsoft-skill-creator skill is not listed in README agent skills section #107

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[Copilot]

Pull request overview

This PR addresses issue #107 by adding documentation for the newly created microsoft-skill-creator skill to the README. The skill was added to the repository but was missing from the README documentation.

Changes:

• Updated skill count from two to three in the Agent Skills section introduction
• Added microsoft-skill-creator entry to the skills comparison table with purpose and best use cases
• Added microsoft-skill-creator to the Quick Setup installation instructions
• Added decision guidance for microsoft-skill-creator in the "Which Skill Do I Need?" matrix

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[TianqiZhang]

@copilot let's think about the wording here. This skill is a meta-skill, it helps people to create real agent skills about microsoft technologies. For example if a user wants to teach coding agent how to use a newly released Azure library, it can use this microsoft-skill-creator skill to create a special skill just for that library.

how to express this idea clearly and concisely in the table?

[Copilot]

Updated the wording to clarify it's a meta-skill that generates other skills. Changed from "Create agent skills" to "Meta-skill that generates custom agent skills" and updated the use case to be more specific: "Creating a skill to teach agents about a new Azure library, .NET feature, or other Microsoft tech". Also updated other mentions for consistency. (commit 70990f6)