Add README for Charting Show Documentation AI Agent Skill

.github/skills/chartingshow-documentation/README.md

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+# Charting Show Documentation Agent Skill
+
+This Agent Skill enhances GitHub Copilot’s coding agent when working in the `chartingshow/documentation` repository by providing domain-specific guidance for the project’s documentation, structure, and contribution conventions.
+
+The goal is to help contributors produce consistent, accurate, and well-structured documentation for Charting Show.
+
+## What This Skill Does
+
+When enabled, this skill helps the agent:
+
+- Understand the purpose and structure of this repository
+- Suggest consistent formatting and content practices
+- Follow existing documentation conventions
+- Guide contributors through writing and editing docs
+- Highlight where content may be missing or unclear
+
+The skill is loaded automatically and only when relevant to the task.
+
+## When the Skill Is Used
+
+This skill may be activated when the agent is asked to:
+
+- Create or update Markdown documentation
+- Propose edits to the README or section pages
+- Suggest links between topics and categories
+- Review content for clarity, structure, and completeness
+- Help with contributor-oriented guidelines
+
+## Documentation Principles
+
+The agent is instructed to:
+
+- Preserve existing formatting conventions
+- Uphold accuracy and factual integrity
+- Avoid unverified claims or speculative content
+- Promote clarity for both new and experienced contributors
+- Make suggestions that align with the project’s style
+
+If the agent is unsure about a suggestion, it should defer for human review rather than guessing.
+
+## Enabling Agent Skills in VS Code
+
+To enable Agent Skills support in VS Code, add the following to your `settings.json`:
+
+```json
+{
+  "chat.useAgentSkills": true
+}
+````
+
+Once enabled, VS Code will automatically detect skills located in `.github/skills/` and load them on demand.