Add systemd-manager

A while back I wrote an application for managing systemd services on Linux systems with Rust and GTK-rs for the GUI front-end.

README.md

@@ -75,6 +75,7 @@ If you want to contribute, please read [this](CONTRIBUTING.md).
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+  * [mmstick/systemd-manager](https://github.com/mmstick/systemd-manager) -- a systemd service manager written in Rust using GTK-rs.
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 * Virtualization
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