Provide screenshots on extension page to optimize first impression of extension

It would be nice to have the possibility to add some screenshots on the extension page to have a visual presentation of the TYPO3 extension. The upload of the images should be inside the extension to keep it simple.

One way could be:

• provide the images in a folder like /Documentation/Images/Screens/
• configure the screens inside the composer.json to let the TER know where to find them
• TER will read the configuration and the images and include them in a image object (e.g. slider or small gallery)

Example config in composer.json could be something like that:

"extra": {
    "typo3/cms": {
      "extension-key": "my_ext_key"
    },
    "typo3-ter": {
      "images": "Documentation\\Images\\Screens\\"
    }
}