Add systemd --user files

sway-session.target

@@ -0,0 +1,8 @@
+# https://github.com/swaywm/sway/wiki/Systemd-integration
+
+[Unit]
+Description=sway compositor session
+Documentation=man:systemd.special(7)
+BindsTo=graphical-session.target
+Wants=graphical-session-pre.target
+After=graphical-session-pre.target

sway.service

@@ -0,0 +1,16 @@
+# https://github.com/swaywm/sway/wiki/Systemd-integration
+
+[Unit]
+Description=sway - SirCmpwn's Wayland window manager
+Documentation=man:sway(5)
+BindsTo=graphical-session.target
+Wants=graphical-session-pre.target
+After=graphical-session-pre.target
+
+[Service]
+Type=simple
+EnvironmentFile=-%h/.config/sway/env
+ExecStart=/usr/bin/sway
+Restart=on-failure
+RestartSec=1
+TimeoutStopSec=10