Add gtfs-viz from Gabriel Hidalgo

[isabelle-dr]

Project: https://github.com/gabrielAHN/gtfs-viz
Referenced in this LinkedIn post: https://www.linkedin.com/feed/update/urn:li:activity:7246478313114804224/

@gabrielAHN do you want to add this awesome tool to this list? 🙂
FYI this list is rendered here: https://gtfs.org/resources/overview/

[gabrielAHN]

Hey @isabelle-dr 👋 that would sound great, let me know what you need from me to make it happen 😊.

Maybe something like this for the blur:

• GTFS Viz 🚉 - A web app that visualizes GTFS Data on the browser at scale without a backend on the client side using duckdb-wasm 🦆.

But yea let me know if you need anything else from me

[isabelle-dr]

Just opened a PR for it #285