Add Zig version to README.md

[bkataru]

This pull request makes a minor update to the README.md file by adding a reference to the new Zig implementation of Pocket Flow in the list of supported languages.

[Copilot]

Pull request overview

This pull request adds a reference to the new Zig implementation of Pocket Flow in the README.md file, expanding the list of supported language versions from six to seven.

Key Changes

• Adds Zig to the list of supported language implementations with a link to the PocketFlow-Zig repository
• Introduces an Oxford comma before the final "and" in the list

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[abdulazeezalimi160111043-afk]

Great addition! Adding Zig support to PocketFlow expands the ecosystem nicely. The implementation looks clean and follows the existing pattern.

I've also been experimenting with PocketFlow + OpenRouter integration for reasoning workflows, and it's impressive how the 100-line framework can handle complex reasoning chains. The minimalist design really shines when combining it with advanced LLM features like reasoning continuation.

Thanks for contributing to the PocketFlow ecosystem!