Add SkillCheck validation badge

[olgasafonova]

Summary

The humanizer skill passes SkillCheck validation checks with only minor warnings. SkillCheck validates Claude Code skills against the agentskills specification, MCP best practices, and WCAG accessibility standards.

Validation Results

Metric	Result
Status	✅ Needs Attention (warnings only, no critical issues)
Passed Checks	35
Available Badges	enterprise, antislop-90

Minor warnings (optional fixes):

• Date-sensitive content (references to specific years that may become stale)
• Top-level version field (Anthropic skills don't typically use this)

Proposal

Would you be interested in adding a SkillCheck badge to the README? The badge helps users identify quality-validated skills.

Example badge:

[![SkillCheck](https://img.shields.io/badge/SkillCheck-Passed-brightgreen)](https://getskillcheck.com)

I'm happy to submit a PR with the badge if you're interested.

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Generated by reviewing skills from the Claude Skills: 36 Examples article.

[olgasafonova]

No worries if this isn't a priority — closing to keep things tidy. Feel free to reopen if you'd like to add the badge later!