add service file

teamcityagent.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=TeamCity Build Agent
+After=network.target
+[Service]
+Type=oneshot
+User=root
+Group=root
+ExecStart=/root/agent/bin/agent.sh start
+ExecStop=-/root/agent/bin/agent.sh stop
+RemainAfterExit=yes
+SuccessExitStatus=0 143
+[Install]
+WantedBy=default.target