Add models (#250)

Adds [models](https://github.com/arimxyer/models) to the Productivity
and Utilities section.

**models** is a fast TUI for browsing AI models, benchmarks, and coding
agents. It uses data from [models.dev](https://models.dev) to let you
browse 2000+ models across 85+ providers, compare ~400 benchmark entries
from Artificial Analysis, and track 12+ coding agents with version
detection — all from the terminal.

Built with ratatui, crossterm, and tokio.

- [crates.io](https://crates.io/crates/modelsdev)
- Install: `cargo install modelsdev`

Author: arimxyer

README.md

@@ -271,6 +271,7 @@ Aside from those listed here, many other apps and libraries can be easily be fou
 - [lt](https://github.com/markmarkoh/lt) - An unofficial TUI client for Linear.app.
 - [md-tui](https://github.com/henriklovhaug/md-tui) - Markdown renderer in the terminal.
 - [meteo-tui](https://github.com/16arpi/meteo-tui) - French weather app in the command line.
+- [models](https://github.com/arimxyer/models) - A TUI for browsing AI models, benchmarks, and coding agents.
 - [mprocs](https://github.com/pvolok/mprocs) - Run multiple commands in parallel and shows output of each command separately.
 - [neura-hustle-tracker](https://github.com/adolfousier/neura-hustle-tracker) - A privacy-first TUI to track what apps you use and how long you spend on them.
 - [numr](https://github.com/nasedkinpv/numr) - A natural language calculator with unit/currency conversions and vim-style keybindings.