Add systemd service unit file and D-Bus config

The unit file is only for debugging purposes.
The Makefile is used to install (link --runtime), start, stop, and
restart the service, and to see the output (journalctl)

Makefile

@@ -0,0 +1,19 @@
+install-debug:
+	@sudo systemctl --runtime link sfsmcd/sfsmc-debug@.service
+.PHONY: install-debug
+
+journalctl:
+	@journalctl -efSnow -usfsmc-debug@$$(cd ..; pwd) -ocat
+.PHONY: journalctl
+
+start:
+	@sudo systemctl start sfsmc-debug@$$(cd ..; pwd)
+.PHONY: start
+
+stop:
+	@sudo systemctl stop sfsmc-debug@$$(cd ..; pwd)
+.PHONY: stop
+
+restart:
+	@sudo systemctl restart sfsmc-debug@$$(cd ..; pwd)
+.PHONY: restart