Add init script for openwrt. (#8)

examples/openwrt-init.d/dnsmasq_exporter

@@ -0,0 +1,16 @@
+#!/bin/sh /etc/rc.common
+
+START=99
+
+USE_PROCD=1
+PROG="/usr/bin/dnsmasq_exporter"
+LEASES_PATH="/tmp/dhcp.leases"
+LISTEN_ADDR=":9153"
+
+start_service() {
+	procd_open_instance
+	procd_set_param command "$PROG" "-leases_path=${LEASES_PATH}" "-listen=${LISTEN_ADDR}"
+	procd_set_param stdout 1 # forward stdout of the command to logd
+	procd_set_param stderr 1 # same for stderr
+	procd_close_instance
+}