Add README with project overview and usage guide

README.md

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+# OpenCode Skills - HarmonyOS Development
+
+AI coding agent skills for HarmonyOS/ArkTS application development.
+
+## What are Skills?
+
+Skills are structured documentation that teach AI coding assistants (like OpenCode) how to perform specific development tasks. Each skill contains:
+
+- **SKILL.md** - Main skill definition with quick reference and detailed guides
+- **assets/** - Code templates and examples
+- **references/** - Supporting documentation
+
+## Available Skills
+
+### arkts-development
+
+ArkTS/ArkUI development for HarmonyOS applications.
+
+**Covers:**
+- ArkUI declarative UI framework
+- State management decorators (@State, @Prop, @Link)
+- Component lifecycle and navigation
+- Network requests and local storage
+- TypeScript to ArkTS migration
+
+### harmonyos-build-deploy
+
+Build, package, and deploy HarmonyOS applications.
+
+**Covers:**
+- hvigorw build commands
+- ohpm package manager
+- hdc device installation
+- Troubleshooting common errors
+
+## Usage
+
+These skills are automatically loaded by OpenCode when relevant tasks are detected. The AI agent uses the skill documentation to:
+
+1. Follow correct build/deploy procedures
+2. Write code following ArkTS conventions
+3. Troubleshoot common issues
+4. Use proper HarmonyOS APIs
+
+## Repository Structure
+
+```
+skills/
+├── AGENTS.md                   # Guidelines for AI agents
+├── README.md                   # This file
+├── arkts-development/
+│   ├── SKILL.md
+│   ├── assets/
+│   │   ├── component-template.ets
+│   │   └── list-page-template.ets
+│   └── references/
+│       ├── api-reference.md
+│       ├── codelinter.md
+│       ├── component-patterns.md
+│       ├── hstack.md
+│       ├── hvigor-commandline.md
+│       └── migration-guide.md
+└── harmonyos-build-deploy/
+    ├── SKILL.md
+    └── references/
+        └── device-installation.md
+```
+
+## Contributing
+
+To add a new skill:
+
+1. Create a directory with kebab-case name: `my-new-skill/`
+2. Add `SKILL.md` with YAML frontmatter:
+   ```yaml
+   ---
+   name: my-new-skill
+   description: Detailed description for AI agent matching
+   ---
+   ```
+3. Add supporting files in `assets/` and `references/`
+4. Follow conventions in [AGENTS.md](AGENTS.md)
+
+## License
+
+MIT