Linux support

[arnoFleming]

Hi!

I'd like to be using git-together while coding on Linux.
Currently (version 0.1.0-alpha.26) the binary is a Mach-O 64-bit arm64 executable

file  /home/linuxbrew/.linuxbrew/Cellar/git-together/0.1.0-alpha.26/bin/git-together
/home/linuxbrew/.linuxbrew/Cellar/git-together/0.1.0-alpha.26/bin/git-together: Mach-O 64-bit arm64 executable, flags:<NOUNDEFS|DYLDLINK|TWOLEVEL|PIE|HAS_TLV_DESCRIPTORS>

I'm quite capable to build in rust, and make it available in Linux, but I don't know how to make a PR that actually fixes it for Linux users with homebrew.

Alternatively, I'm happy to document building from source in the README, so users on all platforms can benefit.

[kejadlen]

I have no idea how to make a cross-platform binary formula for linuxbrew, but you should be able to download the binary here: https://github.com/kejadlen/git-together/releases/download/v0.1.0-alpha.26/git-together-v0.1.0-alpha.26-stable-x86_64-unknown-linux-gnu.tar.gz

If you can figure out how to make a cross-platform formula, happy to take updates to kejadlen/homebrew-git-together!

[arnoFleming]

Looking at that repo now. Thanks!