Showcase: a GUI for Linux around `sslocal` using GTK

[spyophobia]

A bit of ❤️ for my fellow freedom-loving Linux users: https://github.com/spyophobia/shadowsocks-gtk-rs

Been working on this for a while now, but I still have quite a bit to do.

Currently it's just a tray application that allows easy switching between connection profiles, but I think it's usable enough for me to publish it. Other GUI features are planned and coming.

Feel free to provide feedback! It's still in rapid development.