Enhance README with requirements, examples, and contributing guidelines

[Copilot]

The existing README was functional but missing several standard sections that would help users and contributors better understand and use the project. This PR enhances the documentation with minimal changes to make it more comprehensive and user-friendly.

Changes Made

Added Requirements Section

• Documented Node.js version compatibility (0.10 or higher) based on Travis CI configuration
• Provides clear system requirements for users before installation

Enhanced with Comprehensive Example

• Added a detailed example showing TAP input transformation to xUnit XML output
• Demonstrates both passing and failing test cases with diagnostic information
• Helps users understand exactly what the tool does and what to expect

Added Contributing Guidelines

• Standard open source contribution workflow with clear steps
• Encourages community participation and provides guidance for new contributors
• Includes proper git workflow practices

Added Development Setup

• Instructions for setting up the project locally for development
• Standard commands for cloning, installing dependencies, and running tests
• Helps developers get started quickly

The README now follows modern open source project documentation standards while maintaining all existing functionality. All tests continue to pass, confirming no breaking changes were introduced.

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.