docs: add screenshots

Author: santi

README.md

@@ -14,12 +14,21 @@ The plugin uses a few custom styles. These are automatically included in the [cl
 </head>
 ```
 
+Published in the official [CKEditor plugin repository](https://ckeditor.com/cke4/addon/spotify).
 
-# Translations
+
+## Translations
 
 Currently supports English (en) and Norwegian Bokmål (nb). Want to provide translations for your own language? Please fork the project and open a pull request.
 
 
-# Credits
+## Screenshots
+<img src="/screenshots/spotify-plugin-dialog.png?raw=true" alt="Dialog screenshot" width="300">
+<img src="/screenshots/spotify-plugin-small-widget.png?raw=true" alt="Small widget screenshot" width="300">
+<img src="/screenshots/spotify-plugin-large-widget.png?raw=true" alt="Large widget screenshot" width="300">
+<img src="/screenshots/spotify-plugin-multiple-widgets.png?raw=true" alt="Multiple widgets screenshot" width="300">
+
+
+## Credits
 
 <div>Icons made by <a href="https://www.flaticon.com/authors/freepik" title="Freepik">Freepik</a> from <a href="https://www.flaticon.com/"             title="Flaticon">www.flaticon.com</a> is licensed by <a href="http://creativecommons.org/licenses/by/3.0/"             title="Creative Commons BY 3.0" target="_blank">CC 3.0 BY</a></div>