Add zlap to Command Line and Argument Parser section

[plutowang]

Hi!

I'd like to submit plutowang/zlap, a new command-line argument parser for Zig, to the list.

Since the Zig ecosystem is growing rapidly, I wanted to provide a modern, declarative, and type-safe alternative (inspired by Rust's clap) that supports subcommands and auto-generated help messages out of the box.

(I have run make all locally as requested in the guidelines.)

Thanks for maintaining this awesome list! Let me know if you need any adjustments.

[gemini-code-assist]

Code Review

This pull request adds the zlap library to the list of command-line interface frameworks in the README. The review feedback suggests a minor wording adjustment to the library's description to maintain consistency with other entries in the document, specifically by explicitly mentioning Zig and Rust's clap.

[jiacai2050]

Cool!