Reorganize: Move all skills to skills/ folder

- Created skills/ directory
- Moved 272 skills to skills/ subfolder
- Kept agents/ at root level
- Kept installation scripts and docs at root level

Repository structure:
- skills/           - All 272 skills from skills.sh
- agents/           - Agent definitions
- *.sh, *.ps1       - Installation scripts
- README.md, etc.   - Documentation

Co-Authored-By: Claude <noreply@anthropic.com>

skills/plugins/marketplaces/claude-plugins-official/README.md

@@ -0,0 +1,47 @@
+# Claude Code Plugins Directory
+
+A curated directory of high-quality plugins for Claude Code.
+
+> **⚠️ Important:** Make sure you trust a plugin before installing, updating, or using it. Anthropic does not control what MCP servers, files, or other software are included in plugins and cannot verify that they will work as intended or that they won't change. See each plugin's homepage for more information.
+
+## Structure
+
+- **`/plugins`** - Internal plugins developed and maintained by Anthropic
+- **`/external_plugins`** - Third-party plugins from partners and the community
+
+## Installation
+
+Plugins can be installed directly from this marketplace via Claude Code's plugin system.
+
+To install, run `/plugin install {plugin-name}@claude-plugin-directory`
+
+or browse for the plugin in `/plugin > Discover`
+
+## Contributing
+
+### Internal Plugins
+
+Internal plugins are developed by Anthropic team members. See `/plugins/example-plugin` for a reference implementation.
+
+### External Plugins
+
+Third-party partners can submit plugins for inclusion in the marketplace. External plugins must meet quality and security standards for approval.
+
+## Plugin Structure
+
+Each plugin follows a standard structure:
+
+```
+plugin-name/
+├── .claude-plugin/
+│   └── plugin.json      # Plugin metadata (required)
+├── .mcp.json            # MCP server configuration (optional)
+├── commands/            # Slash commands (optional)
+├── agents/              # Agent definitions (optional)
+├── skills/              # Skill definitions (optional)
+└── README.md            # Documentation
+```
+
+## Documentation
+
+For more information on developing Claude Code plugins, see the [official documentation](https://code.claude.com/docs/en/plugins).