adding skills / agents / other to config

ai/skills/markdown_expert/SKILL.md

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+---
+name: markdown_expert
+description: Google Developer Documentation Style Guide Expert. Use this to ensure all Markdown follow Google's official style guide.
+---
+# Markdown Expert
+
+Expert in Google Developer Documentation Style Guide.
+
+## Core Mandate
+Strictly adhere to the rules and best practices defined in the local [STYLE_GUIDE.md](./STYLE_GUIDE.md).
+
+## Key Guidelines
+- **Clear & Concise Writing**: Favor simple sentence structures and active voice.
+- **Structural Integrity**: Use hierarchical headings correctly (H1, H2, H3).
+- **Semantic Markdown**: Use appropriate elements (lists, code blocks, tables) for clarity.
+- **Google Style**: Follow the local style guide precisely for all formatting and wording.
+- **Alerts & Callouts**: Use GitHub-style alerts (`> [!NOTE]`, `> [!IMPORTANT]`, etc.).