add systemd-manager-tui (rothgar#470)

Author: vernalan

README.md

@@ -480,6 +480,7 @@
 - [recoverpy](https://github.com/PabloLec/recoverpy) A TUI to recover overwritten or deleted data.
 - [rocket.term](https://github.com/gerstner-hub/rocket.term) Text based chat client for the Rocket.chat messaging solution.
 - [steam_friends_list_tui](https://github.com/AdamWHY2K/steam_friends_list_tui) The steam friends list in the commandline
+- [Systemd-manager-tui](https://github.com/matheus-git/systemd-manager-tui) A program for managing systemd services through a TUI.
 - [tcpterm](https://github.com/sachaos/tcpterm) tcpterm is a packet visualizer in TUI.
 - [tab-pal](https://github.com/ben-n93/tab-pal) Add and edit custom colour palettes in Tableau from the command-line.
 - [term.everything](https://github.com/mmulet/term.everything) Run any GUI app in the terminal