Added instructions for developer mode installation

README.md

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-# [🌟Ads：MyNav chrome extension](https://chromewebstore.google.com/detail/my-nav/hagcohiondnnjimialmlneleljfmkflf?authuser=0&hl=en)
-
 # bulk-delete-chatGPT
 
-English | [中文版本](./README-CN.md)
-
-## Project Introduction
+[Original work by qcrao](https://github.com/qcrao/bulk-delete-chatGPT)
 
 `bulk-delete-chatGPT` is a Chrome extension designed to bulk-delete conversations on ChatGPT pages. This extension allows you to quickly and easily manage conversations on ChatGPT pages. It features a clean and intuitive user interface, providing an efficient way to perform bulk deletion of conversations.
 
@@ -12,20 +8,26 @@ English | [中文版本](./README-CN.md)
 
 <table>
   <tr>
-    <td><img src="./assets/1.jpg" alt="图片1" style="max-width: 100%;"></td>
-    <td><img src="./assets/2.jpg" alt="图片2" style="max-width: 100%;"></td>
-    <td><img src="./assets/3.jpg" alt="图片3" style="max-width: 100%;"></td>
+    <td><img src="./assets/1.jpg" alt="Screenshot 1" style="max-width: 100%;"></td>
+    <td><img src="./assets/2.jpg" alt="Screenshot 2" style="max-width: 100%;"></td>
+    <td><img src="./assets/3.jpg" alt="Screenshot 3" style="max-width: 100%;"></td>
   </tr>
 </table>
 
+## Installation Instructions (Developer Mode)
+
+1.  Download the extension files from this repository.
+2.  Open Chrome and navigate to [`chrome://extensions`](chrome://extensions).
+3.  Enable "Developer mode" in the top right corner.
+4.  Click "Load unpacked" and select the directory where you saved the extension files.
+5.  The extension should now be installed and visible in your Chrome toolbar.
+
 ## Usage Instructions
 
-- Go to the [ChatGPT Bulk Delete Chrome extension page](https://chrome.google.com/webstore/detail/chatgpt-bulk-delete/effkgioceefcfaegehhfafjneeiabdjg) in the Chrome Web Store.
-- Click the "Add to Chrome" button to install the extension.
-- Open the [ChatGPT website page](https://chat.openai.com/).
-- Click the `bulk-delete-chatGPT` extension icon in the top-right corner of your browser.
-- Click the "Add checkboxes" button. The extension will automatically add a checkbox in front of each conversation on the ChatGPT page.
-- Select the conversations you wish to delete.
-- Click the "Bulk delete" button, and the selected conversations will be deleted.
-- If needed, you can click the "Remove checkboxes" button to hide the checkboxes.
-- It's possible to select all checkboxes between your last selection and the one being selected by holding shift.
+-   Open the [ChatGPT website page](https://chat.openai.com/).
+-   Click the `bulk-delete-chatGPT` extension icon in the top-right corner of your browser.
+-   Click the "Add checkboxes" button. The extension will automatically add a checkbox in front of each conversation on the ChatGPT page.
+-   Select the conversations you wish to delete.
+-   Click the "Bulk delete" button, and the selected conversations will be deleted.
+-   If needed, you can click the "Remove checkboxes" button to hide the checkboxes.
+-   It's possible to select all checkboxes between your last selection and the one being selected by holding shift.