implement Code::escaped method

src/Code.php

@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yggverse\Gemtext;
+
+class Code
+{
+    /*
+     * Helper method
+     *
+     * Detect line given is escaped by previous iteration
+     */
+    public static function escaped(string $line, bool &$status): bool
+    {
+        if (preg_match('/^```/m', $line))
+        {
+            $status = !($status); // toggle
+        }
+
+        return $status;
+    }
+}