Added installation instructions and example files

moshing-mammut.service.EXAMPLE

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+[Unit]
+Description=Moshing Mammut
+
+[Service]
+ExecStart=/PATH_TO_MOSHING_MAMMUT/start.sh
+Restart=always
+User=MOSHING_MAMMUT_USER
+Group=nogroup
+Environment=PATH=/usr/bin:/usr/local/bin
+Environment=NODE_ENV=production
+WorkingDirectory=/PATH_TO_MOSHING_MAMMUT/
+KillMode=process
+
+[Install]
+WantedBy=multi-user.target