Update README with comprehensive documentation for modern features

[Copilot]

• Review current README and identify outdated content
• Update README with modern features and capabilities based on codebase analysis
• Replace outdated screenshots with references to current UI
• Add comprehensive feature list including all modern features
• Add "Getting Started" section with clearer instructions
• Add "Contributing" section for contributors
• Update prerequisites with more accurate requirements
• Add troubleshooting/common issues section
• Update links and badges
• Verify all documentation is accurate and helpful
• Address PR review feedback:
  • Enhanced First Time Setup with Settings explanation and auto-detection notes
  • Corrected Control Type options to standard or virtual
  • Marked Version field as read-only
  • Made Solution Details optional
  • Added "Project File Not Found" troubleshooting
  • Enhanced Deployment Issues with XrmToolBox connection note
  • Added Debugging the Tool section with detailed steps
  • Replaced Community Chat with GitHub Discussions

Original prompt

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This section details on the original issue you should resolve

<issue_title>ReadMe is out-dated</issue_title>
<issue_description>Describe the bug
With new improvements added to the tool; readme file is outdated with old screenshots.</issue_description>

<agent_instructions>The README should mostly focus on the end-user but also should provide information for the contributors </agent_instructions>

Comments on the Issue (you are @copilot in this section)

Fixes #41

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[Copilot]

Pull Request Overview

This PR comprehensively updates the README documentation to reflect modern features and capabilities of the PCF Custom Control Builder XrmToolBox plugin. The update addresses outdated content, removes old screenshots, and provides detailed user and contributor guidance.

• Replaced basic overview with comprehensive feature documentation including PCF Features API, template support, and modern capabilities
• Added detailed Getting Started section with setup instructions, control creation workflow, and troubleshooting guidance
• Expanded contributor documentation with development setup, debugging instructions, and code guidelines

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