[WIP] Revamp README.md for Production-Ready Open Source Release

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original description:

Revamp the README.md file to make it production-ready for open source use, following best practices. The improved README should include:

• Clear project overview and purpose
• Table of Contents
• Features section
• Getting Started (prerequisites)
• Installation instructions
• Usage instructions (how to build and load the extension, how to use it)
• Development workflow
• Script references
• Configuration section (describing Issuer Domain and Client ID usage)
• Contributing guidelines section (referencing CONTRIBUTING.md)
• License section with link to LICENSE
• Screenshot image (using the provided image link)
• Cleaner formatting and improved clarity

Reference image for screenshot:

Apply these changes directly to README.md in the main branch.

This pull request was created as a result of the following prompt from Copilot chat.

Revamp the README.md file to make it production-ready for open source use, following best practices. The improved README should include:

• Clear project overview and purpose
• Table of Contents
• Features section
• Getting Started (prerequisites)
• Installation instructions
• Usage instructions (how to build and load the extension, how to use it)
• Development workflow
• Script references
• Configuration section (describing Issuer Domain and Client ID usage)
• Contributing guidelines section (referencing CONTRIBUTING.md)
• License section with link to LICENSE
• Screenshot image (using the provided image link)
• Cleaner formatting and improved clarity

Reference image for screenshot:

Apply these changes directly to README.md in the main branch.

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