Add vulnerable Docker image

vuln_rfi/src/about.txt

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+I am an old and accustomed developer who wrote too much source code in my life...

vuln_rfi/src/home.txt

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+Welcome to this strong and almost secure website!
+
+Please use the menu below to access the different parts of the application...

vuln_rfi/src/index.php

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+<?php
+/**
+ * My home page
+ */
+
+$page = __DIR__."home.txt";
+
+if(isset($_GET["page"]))
+    $page = $_GET["page"];
+
+?>
+
+<pre>
+<?php echo file_get_contents($page); ?>
+</pre>
+
+Browse my website:
+<ul>
+    <li><a href="index.php?page=home.txt">home</a></li>
+    <li><a href="index.php?page=about.txt">about</a></li>
+    <li><a href="index.php?page=privacy.txt">privacy</a></li>
+</ul>

vuln_rfi/src/privacy.txt

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+Privacy policy: TODO