Add eval example

example/eval.php

@@ -0,0 +1,40 @@
+<?php
+/*
+ * This file is part of VFS
+ *
+ * Copyright (c) 2014 Andrew Lawson <http://adlawson.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+use Vfs\FileSystem;
+
+require __DIR__ . '/../vendor/autoload.php';
+
+FileSystem::factory('eval://');
+
+file_put_contents('eval://foo.php', <<<'EOF'
+<?php
+
+class Foo
+{
+    protected $name;
+
+    public function __construct($name)
+    {
+        $this->name = $name;
+    }
+
+    public function getName()
+    {
+        return $this->name;
+    }
+}
+EOF
+);
+
+require 'eval://foo.php';
+
+$foo = new Foo('bar');
+
+var_dump($foo->getName());