Add Ghostty entry to readme.md

[genarod]

Ghostty is a fast, feature-rich, and cross-platform terminal emulator. License is MIT: https://github.com/ghostty-org/ghostty/blob/main/LICENSE Just to make sure my intent is clear, I used iTerm2 but a couple of months ago I switched to Ghostty and have not looked back. Highly recommended. As I have found your directory quise useful, I think it should be added