add shikane-watchdog user service to auto-recover shikane deadlocks

.config/systemd/user/shikane-watchdog.timer

@@ -0,0 +1,10 @@
+[Unit]
+Description=Run shikane watchdog every 2 minutes
+
+[Timer]
+OnBootSec=2min
+OnUnitInactiveSec=2min
+AccuracySec=5s
+
+[Install]
+WantedBy=timers.target