composer.json missing

Please find below the content of composer.json file for the module. Please modify author information if not correct. Added support for D9 in composer.json.

{
  "name": "drupal/config_default_image",
  "description": "Image field formatter allowing to set a default image deployable through config management. It stores a file path into config, instead of a content uuid.",
  "type": "drupal-module",
  "keywords": ["Drupal", "Image"],
  "homepage": "https://www.drupal.org/project/config_default_image",
  "license": "GPL-2.0+",
  "authors": [{
    "name": "GaëlG",
    "homepage": "https://www.drupal.org/u/ga%C3%ABlg",
    "role": "Maintainer"
  }],
  "support": {
    "issues": "https://www.drupal.org/project/issues/config_default_image",
    "source": "https://git.drupalcode.org/project/config_default_image"
  },
  "require": {
    "drupal/core": "^8.0 || ^9.0"
  }
}

Thanks!