Added the support for generating docs from template doc

app/Services/Documents/TokenScanner.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Services\Documents;
+
+class TokenScanner
+{
+    private const REGEX = '/{{\s*([a-zA-Z0-9_]+\.[a-zA-Z0-9_]+)\s*}}/';
+
+    /**
+     * @return array<int,string>
+     */
+    public function scan(string $content): array
+    {
+        preg_match_all(self::REGEX, $content, $m);
+        if (empty($m[1])) {
+            return [];
+        }
+
+        return array_values(array_unique($m[1]));
+    }
+}