Add gogpu/systray to GUI Interaction

Author: kolkov

README.md

@@ -1454,6 +1454,7 @@ _Toolkits_
 _Interaction_
 
 - [AppIndicator Go](https://github.com/gopherlibs/appindicator) - Go bindings for libappindicator3 C library.
+- [gogpu/systray](https://github.com/gogpu/systray) - Pure Go system tray library for Windows, macOS, and Linux with zero CGO (part of [GoGPU](https://github.com/gogpu) ecosystem).
 - [gosx-notifier](https://github.com/deckarep/gosx-notifier) - OSX Desktop Notifications library for Go.
 - [mac-activity-tracker](https://github.com/prashantgupta24/activity-tracker) - OSX library to notify about any (pluggable) activity on your machine.
 - [mac-sleep-notifier](https://github.com/prashantgupta24/mac-sleep-notifier) - OSX Sleep/Wake notifications in golang.