Add basic README.md with an example

example/alpine/init

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+#!/bin/sh
+
+# Special folders
+mkdir -p /dev /proc /sys
+[ -c /dev/console ] || mknod -m 600 /dev/console c 5 1
+mount -t proc proc /proc
+mount -t sysfs sysfs /sys
+mount -t devtmpfs dev /dev
+
+# Networking
+echo slim > /proc/sys/kernel/hostname
+modprobe virtio_net
+ip link set lo up 2>/dev/null
+ip link set eth0 up 2>/dev/null
+udhcpc -i eth0 -f -q # Get DHCP lease
+
+echo
+echo 'Welcome to slim!'
+echo
+
+# Run interactive shell
+/bin/sh </dev/console >/dev/console 2>&1
+
+poweroff -f
+while true; do
+    sleep 1
+    poweroff -f
+done