added readme

README.md

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+# Claude Code Plugins Marketplace
+
+A curated marketplace of high-quality plugins for Claude Code.
+
+## 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.
+
+## 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).