feat(#24): implement mosaic-plugin-calendar skill

packages/skills/README.md

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+# Mosaic Stack Skills
+
+This directory contains Clawdbot skills for integrating with Mosaic Stack APIs.
+
+## Skills
+
+### Calendar (`calendar/`)
+
+Integration with Mosaic Stack's Events API for calendar management.
+
+**Features:**
+- Create events with rich metadata
+- Query events with flexible filtering
+- Update and reschedule events
+- Delete/cancel events
+- Natural language interaction support
+
+**Usage:** See `calendar/SKILL.md` for complete documentation.
+
+## Skill Structure
+
+Each skill follows Clawdbot skill conventions:
+
+```
+skill-name/
+├── SKILL.md          # Skill documentation and metadata
+└── scripts/          # Executable tools for skill functionality
+```
+
+## Adding New Skills
+
+1. Create a new directory under `packages/skills/`
+2. Add `SKILL.md` with YAML frontmatter and documentation
+3. Add any necessary scripts or resources
+4. Update this README