Add example to readme

AliExpress-Invoice-Downloader.user.js

@@ -1,7 +1,7 @@
 // ==UserScript==
 // @name         AliExpress Invoice Downloader
 // @namespace    https://www.aliexpress.com
-// @version      1.0
+// @version      1.1
 // @description  Adds download buttons to the Aliexpress order page (https://www.aliexpress.com/p/order/index.html) and a bulk download button to download all invoices on the order page to save time.
 // @match        https://www.aliexpress.com/p/order/index.html*
 // @grant        GM_download
@@ -43,7 +43,10 @@
   }
 
   function sanitizeFileName(name) {
-    const sanitized = name.replace(/[^\x00-\x7F]/g, "").replace(/\s+/g, "_");
+    const sanitized = name
+      .replace(/[^\x00-\x7F]/g, "")
+      .replace(/\s+/g, "_")
+      .replace(/[/\\?%*:|"<>]/g, "_"); // Remove illegal filename characters
     return sanitized.substring(0, 16);
   }
 

README.md

@@ -5,3 +5,9 @@
 ### [Mirror (Greasyfork)](https://greasyfork.org/en/scripts/488177-aliexpress-invoice-downloader)
 
 Adds download buttons to the Aliexpress order page (https://www.aliexpress.com/p/order/index.html) and a bulk download button to download all invoices on the order page to save time.
+
+Adds a red "download all invoices" button in the bottom left corner
+
+Adds a button to each order to download individual invoices quickly without needing to open the "order details" page
+
+![order button image](image.png)