Added systemd.service for seednode operation

seednode/README.md

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+# Bisq Seed Node
+
+The distribution ships with a systemd .desktop file. Validate/change the executable/config paths within the shipped `bisq-seednode.service` file and copy/move the file to your systemd directory (something along `/usr/lib/systemd/system/`). Now you can control your *Seed Node* via the usual systemd start/stop commands
+
+```
+systemctl start bisq-seednode.service
+systemctl stop bisq-seednode.service
+```
+and
+```
+systemctl enable bisq-seednode.service
+systemctl disable bisq-seednode.service
+```
+
+Follow the logs created by the service by inspecting
+
+```
+journalctl --unit bisq-seednode --follow
+```

seednode/bisq-seednode.service

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+[Unit]
+Description=Bisq Seed Node
+After=network.target
+
+[Service]
+Environment="JAVA_OPTS=-Xms800M -Xmx800M"
+ExecStart=/home/bisq/bisq/bisq-seednode --appName=seed_BTC_MAINNET --nodePort=8000 --userDataDir=/home/bisq/ --maxConnections=50 --baseCurrencyNetwork=BTC_MAINNET
+Restart=on-failure
+
+User=bisq
+Group=bisq
+
+[Install]
+WantedBy=multi-user.target