Add radar to showcase/apps

[wcampbell0x2a]

Feel free to merge or close!

[joshka]

Cool app. So far as a showcase app, I'd like to see a bit more color, and to reduce the image width to 1200 (this fits a bit nicer in the site design)

Adding a bit more color will make some of the UI elements stand out a bit more. Take a look at the examples on https://github.com/ratatui/ratatui/blob/main/examples/README.md for some inspiration. We have a couple of color palettes included in Ratatui that are worth looking at - Tailwind and Material. Take a look at https://docs.rs/ratatui/0.28.1/ratatui/style/palette/index.html

I'd also recommend adding this to https://github.com/ratatui/awesome-ratatui, https://forum.ratatui.rs and the ratattui discord.

[orhun]

I recently shared this app on reddit and people loved it: https://www.reddit.com/r/linux/comments/1f7vvuw/view_planes_around_you_from_the_terminal/

We should definitely add it to the showcase after some tweaks :)