add install script | add minimal readme

README.md

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+## Firewall integration in systemd
+
+
+
+Simple tool to load your **iptables** rules at boot time. It integrates with systemd as a multi instance service.
+
+
+
+##### 1/ Install the tool
+
+Launch the `./install.sh` script as root.
+
+##### 2/ Define your rules
+
+Place a bash script defining your **iptables** rules into `/opt/firewall/<config_name>.fw` where `<config_name>` is an arbitrary name that makes sense to you.
+
+##### 3/ Enable at boot
+
+To enable your rules to load at boot time, simply run `systemctl enable firewall@<config_name>.service`.  If you want to execute your script explicitly run `systemctl start firewall@<config_name>.service`.
+

install.sh

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+#!/bin/bash
+
+root=$(realpath $(dirname $0));
+
+# 1/ copy the service file
+mkdir -p /usr/lib/systemd/system/;
+cp -r ./usr/lib/systemd/system/firewall@.service /usr/lib/systemd/system/;