added systemd script for sysadmin

doc/hushd-systemd.md

@@ -0,0 +1,26 @@
+# Systemd script for the Hush daemon
+
+## Set it up
+
+First set it up as follows:
+* Copy hushd.service to the /usr/lib/systemd/user directory (on Arch Linux, but I believe it's the same for the others too)
+
+## Basic Usage
+
+How to start the script:
+`systemctl start --user hushd.service`
+
+How to stop the script:
+`systemctl stop --user hushd.service`
+
+How to restart the script:
+`systemctl stop --user hushd.service`
+
+## How to watch it as it starts
+
+Use the following:
+`watch systemctl status --user hushd.service`
+
+## Troubleshooting
+
+Don't run it with sudo or root, or it won't work with the wallet.

doc/hushd.service

@@ -0,0 +1,9 @@
+[Unit]
+Description=Hush daemon
+After=network.target
+
+[Service]
+ExecStart=/usr/bin/hushd
+
+[Install]
+WantedBy=default.target