Added example shell script to run Qortal and updated README.md

run.sh

@@ -0,0 +1,26 @@
+#!/bin/sh
+
+# There's no need to run as root, so don't allow it, for security reasons
+if [ "$USER" = "root" ]; then
+	echo "Please su to non-root user before running"
+	exit
+fi
+
+# Limits Java JVM stack size and maximum heap usage.
+# Comment out for bigger systems, e.g. non-routers
+JVM_MEMORY_ARGS="-Xss256k -Xmx128m"
+
+# Although java.net.preferIPv4Stack is supposed to be false
+# by default in Java 11, on some platforms (e.g. FreeBSD 12),
+# it is overriden to be true by default. Hence we explicitly
+# set it to true to obtain desired behaviour.
+nohup nice -n 20 java \
+	-Djava.net.preferIPv4Stack=false \
+	-XX:NativeMemoryTracking=summary \
+	${JVM_MEMORY_ARGS} \
+	-jar qortal.jar \
+	1>run.log 2>&1 &
+
+# Save backgrounded process's PID
+echo $! > run.pid
+echo qortal running as pid $!