Create README.md for YouTube MCP Server

Added README.md for YouTube MCP Server with features and installation instructions.

Author: aardeshir

src/youtube/README.md

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+# YouTube MCP Server
+
+MCP server for YouTube Data API integration - search videos, manage playlists.
+
+## Features
+
+- Search YouTube videos
+- Create playlists
+- Add videos to playlists
+- List user playlists
+- Delete playlists
+- OAuth2 authentication
+
+## Installation
+
+### NPM Package
+```bash
+npm install -g @a.ardeshir/youtube-mcp
+youtube-mcp-setup  # Run OAuth setup wizard