This PR significantly enhances the README.md documentation to provide a much more comprehensive and user-friendly guide for the waitfor-postgres library.

Key Improvements

Added Essential Information

• Installation instructions with go get command
• Status badges for build status, Go version, and license
• Detailed library description explaining purpose and use cases
• Features overview highlighting key capabilities

Enhanced Usage Examples

• Multiple code examples covering different scenarios:
  • Basic connection testing
  • Multiple database support
  • Custom configuration with retry logic
  • Proper error handling patterns
  • Context and timeout usage

Technical Documentation

• URL format documentation with support for both postgres:// and postgresql:// schemes
• Configuration options table with clear descriptions and defaults
• URL components breakdown explaining all parts of connection strings
• API reference for waitfor framework options

Integration Guidance

• Docker Compose example showing service configuration
• Kubernetes init container example for orchestration
• Troubleshooting section with common issues and solutions
• Debugging tips for development

Code Quality

• All code examples have been verified to compile and work correctly
• Proper imports and syntax throughout all examples
• Consistent formatting and clear comments
• Realistic connection strings that match actual usage patterns

The documentation now transforms from a minimal 31-line file to a comprehensive 214-line guide that properly explains the library's capabilities, provides multiple working examples, and helps users integrate it effectively into their projects.

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