add console systemd service (#627)

Co-authored-by: Daniel Valdivia <hola@danielvaldivia.com>

systemd/README.md

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+# Systemd service for MinIO Console
+
+Systemd script for MinIO Console.
+
+## Installation
+
+- Systemd script is configured to run the binary from /usr/local/bin/.
+- Systemd script is configured to run the binary as `console-user`, make sure you create this user prior using service script.
+- Download the binary. Find the relevant links for the binary https://github.com/minio/console#binary-releases.
+
+## Create the Environment configuration file
+
+This file serves as input to MinIO Console systemd service.
+
+```sh
+$ cat <<EOT >> /etc/default/minio-console
+# Special opts
+CONSOLE_OPTS="--port 8443"
+
+# salt to encrypt JWT payload
+CONSOLE_PBKDF_PASSPHRASE=CHANGEME
+
+# required to encrypt JWT payload
+CONSOLE_PBKDF_SALT=CHANGEME
+
+# MinIO Endpoint
+CONSOLE_MINIO_SERVER=http://minio.endpoint:9000
+
+EOT
+```
+
+## Systemctl
+
+Download `minio-console.service` in  `/etc/systemd/system/`
+
+```
+( cd /etc/systemd/system/; curl -O https://raw.githubusercontent.com/minio/console/master/systemd/minio-console.service )
+```
+
+Enable startup on boot
+
+```
+systemctl enable minio-console.service
+```
+
+## Note
+
+- Replace ``User=console-user`` and ``Group=console-user`` in minio-console.service file with your local setup.
+- Ensure that ``CONSOLE_PBKDF_PASSPHRASE`` and ``CONSOLE_PBKDF_SALT`` are set to appropriate values.
+- Ensure that ``CONSOLE_MINIO_SERVER`` is set to appropriate server endpoint.

systemd/console.service

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+[Unit]
+Description=MinIO Console
+Documentation=https://docs.min.io
+Wants=network-online.target
+After=network-online.target
+AssertFileIsExecutable=/usr/local/bin/console
+
+[Service]
+WorkingDirectory=/usr/local/
+
+User=console-user
+Group=console-user
+
+EnvironmentFile=/etc/default/minio-console
+
+ExecStart=/usr/local/bin/console server $CONSOLE_OPTS
+
+# Let systemd restart this service always
+Restart=always
+StartLimitBurst=2
+StartLimitInterval=5
+
+# Specifies the maximum file descriptor number that can be opened by this process
+LimitNOFILE=65536
+
+# Disable timeout logic and wait until process is stopped
+TimeoutStopSec=infinity
+SendSIGKILL=no
+
+[Install]
+WantedBy=multi-user.target