Added Traggo (#3430)

Added Traggo: a time tracker without tasks, only tagged time spans.

README.md

@@ -1992,6 +1992,7 @@ _Related: [Task Management & To-do Lists](#task-management--to-do-lists), [Softw
 - [ActivityWatch](https://activitywatch.net) - An app that automatically tracks how you spend time on your devices. ([Source Code](https://github.com/ActivityWatch/activitywatch)) `MPL-2.0` `Python`
 - [Kimai](https://www.kimai.org/) - Kimai is a free & open source timetracker. It tracks work time and prints out a summary of your activities on demand. ([Demo](https://www.kimai.org/demo/), [Source Code](https://github.com/kevinpapst/kimai2/)) `MIT` `PHP`
 - [TimeTagger](https://timetagger.app) - An open source time-tracker based on an interactive timeline and powerful reporting. ([Demo](https://timetagger.app/app/demo), [Source Code](https://github.com/almarklein/timetagger)) `GPL-3.0` `Python`
+- [Traggo](https://traggo.net/) - Traggo is a tag-based time tracking tool. In Traggo there are no tasks, only tagged time spans. ([Source Code](https://github.com/traggo/server)) `GPL-3.0` `Docker/Go`
 
 
 ### URL Shorteners