Add blog post: MongoDB Atlas Search and Full-Text Indexing with SQL-Style Text Search

Comprehensive tutorial covering MongoDB Atlas Search capabilities including:
- Advanced full-text search with relevance scoring
- Semantic search and vector search integration
- Faceted search with aggregations and analytics
- Auto-completion and search suggestions
- Performance optimization and search analytics
- QueryLeaf SQL-style search syntax and operations

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: rathboma