Update README, use external URL to show screenshot

README.md

@@ -2,7 +2,7 @@
 
 This tool translates a Markdown file into another (natural) language by using OpenAI's ChatGPT API. Its main purpose is to help people translate docs sites for open-source libraries.
 
-![Screenshot](docs/screenshot.webp)
+![Screenshot](https://raw.githubusercontent.com/smikitky/chatgpt-md-translator/main/docs/screenshot.webp)
 
 As an example, this is React Tutorial translated into Japanese with this tool: [チュートリアル：三目並べ](https://ja-react-8aa88t4yk-fbopensource.vercel.app/learn/tutorial-tic-tac-toe)