Add deployment info

deployment/INSTALL

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+# stay sane, sir. just all the more important steps.
+
+adduser bitvend --system --home /var/bitvend
+apt install pigpiod
+systemctl enable pigpiod
+systemctl start pigpiod
+cp bitvend.service /etc/systemd/system
+pip install -r /var/bitvend/requirements.txt
+systemctl enable bitvend
+systemctl start bitvend

deployment/bitvend.service

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+[Unit]
+Description=bitvend service
+After=pigpiod.service
+
+[Service]
+Type=simple
+User=bitvend
+WorkingDirectory=/var/bitvend
+ExecStart=/usr/bin/python3 -u /var/bitvend/bitvend.py
+Restart=on-failure
+
+[Install]
+WantedBy=multi-user.target