Add link to qr_image_exporter in README

[mem-5514-tahara]

PR Description

Hi @kevmoo,

Following up on my previous PR and your suggestion, I have published the PNG export functionality as a separate, lightweight package: qr_image_exporter.

This PR adds a link to the new package in the README. Based on the feedback from the code assistant, I've created a dedicated "Exporting" section to clearly distinguish it from UI-based libraries. This directly addresses the long-standing request in #62 by providing users with a clear solution for generating image data.

This approach allows the core qr.dart package to remain dependency-free while improving discoverability for this common use case.

Changes:

• Added a new "Exporting" section to README.md.
• Added a link to qr_image_exporter in README.md.

Thank you for the guidance on this!

[gemini-code-assist]

Summary of Changes

Hello @mem-5514-tahara, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the project's README.md to include a link to the newly published qr_image_exporter package. This package offers a dedicated solution for exporting QR codes as PNG image data, addressing user needs for image export functionality while ensuring the core qr.dart library remains lightweight and free of additional dependencies. The update provides a clear path for users seeking image export capabilities.

Highlights

• Documentation Update: A new link has been added to the README.md file, directing users to the qr_image_exporter package.
• New Package Integration: The qr_image_exporter package, which provides PNG export functionality for QR codes, is now referenced in the project's documentation.
• Dependency Management: This change supports keeping the core qr.dart package dependency-free by externalizing image export capabilities into a separate, lightweight package.

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[gemini-code-assist]

Code Review

This pull request adds a link to the qr_image_exporter package in the README, which provides PNG export functionality. The change is straightforward and follows your suggestion to externalize this feature. My only suggestion is to place this link under a new 'Exporting' section in the README, as you also mentioned in the PR description. This would improve the document's structure by separating UI/rendering libraries from data export utilities.