first commit, first version of readme and ip.php

README.md

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+### Content
+#### ip.behrens.io
+This is a little helper script written in PHP. Just put it on a webserver and call it. It will give you your current IP address (IPv4 and IPv6) and the corresponding reverse DNS.
+##### Options
+``` ?ptr=false
+Disables reverse DNS lookup
+###### ToDo List
+* give possibilities for different outputs
+* implement in ruby and python

ip.behrens.io/ip.php

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+<?php
+$ip = $_SERVER["REMOTE_ADDR"];
+echo "IP Adresse: $ip\n";
+if ($_GET["ptr"] != "false") {
+  $host = gethostbyaddr($ip);
+  echo "Hostname: $host\n";
+}
+?>