chore: add screenshots

Author: jankal

README.md

@@ -7,3 +7,9 @@ For metadata, https://github.com/nuonic-digital/plugin-data is facilitated.
 To install this plugin, download it's latest release from GitHub.
 
 This plugin will also keep itself up to date as it is available through https://packagist.org/ as well.
+
+## Screenshots
+
+![Plugin List EN](https://raw.githubusercontent.com/nuonic-digital/plugin-installer/main/src/Resources/store/images/en/0.png)
+
+![Plugin List EN](https://raw.githubusercontent.com/nuonic-digital/plugin-installer/main/src/Resources/store/images/de/0.png)