Add gity

[dipankar]

Hi! Adding gity.

I know this list is strictly git <subcommand> addons, and gity is a separate binary — happy to close if it doesn't fit the list's scope. Pitching it because gity's register command makes Git itself accelerate (core.fsmonitor is set to gity fsmonitor-helper, which Git then invokes directly), so it's a sibling to entries like git-extras and git-fixup that extend Git's runtime behavior — just at a different layer.

The entry follows the format from CONTRIBUTING.md: H2 anchor, intro paragraph, and one fenced bash block per subcommand (gity register, gity status, gity list) plus the matching TOC entry.

gity is a cross-platform Rust daemon that makes Git fast on large repositories. It implements the Git fsmonitor v2 protocol, watches the working tree with native OS file watchers (inotify / FSEvents / ReadDirectoryChangesW), and serves git status from cache. Once registered, git status in a million-file repo returns in milliseconds.

• License: MIT
• Cross-platform: Linux, macOS, Windows
• Distributed via crates.io, npm (gity-cli), PyPI, Homebrew, and platform-native packages
• I am a maintainer of the project.