Introduce timetracker application

- source code
- systemd files
- readme
- debian install scripts
- github workflows

Readme.md

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+# Timetracker
+
+Tracks every 5 minutes if system is running to store the beginning and end of using the system.
+
+## Parameters
+
+The timetracker application provides the following arguments which can be passed:
+
+| Property      | Description                                                                |
+|---------------|----------------------------------------------------------------------------|
+| configpath    | Defines the location of the necessary files, default: /var/lib/timetracker |
+
+## Execution
+
+The application is triggered by a systemd timer which triggers the application via systemd unit.
+
+## License
+
+This application is published under the [MIT license](LICENSE).