Enhanced README with comprehensive usage documentation

[coolguy525]

What's Changed

• Added detailed overview and installation instructions with feature flag examples
• Included practical code examples for basic model loading, image classification, and advanced configuration
• Added API overview covering core types, methods, and supported data types
• Documented performance considerations and troubleshooting guide
• Added contributing guidelines and support information

Key Additions

• Quick Start: Three working code examples (basic inference, image classification, NPU configuration)
• API Reference: Core types, methods, and data type support
• Examples Section: How to run included examples with proper feature flags
• Performance Tips: Zero-copy buffers, core selection, batch processing
• Troubleshooting: Common issues and debug features