Add composer.json file to the project

I added a composer.json file with some basic but important information:

{
  "name": "drupal/copyscape",
  "type": "drupal-module",
  "keywords": ["Drupal", "Plagiarism"],
  "description": "This module integrates the Copyscape API and checks the originality of content published.",
  "homepage": "https://git.drupalcode.org/project/copyscape",
  "authors": [
    {
      "name": "Daniel Rodriguez",
      "homepage": "https://www.drupal.org/u/danrod",
      "role": "Maintainer"
    }
  ],
  "support": {
      "issues": "https://www.drupal.org/project/copyscape",
      "source": "https://git.drupalcode.org/project/copyscape"
  },
  "license": "GPL-2.0-or-later",
  "minimum-stability": "dev",
  "require": {
    "php": "^8.1"
  }
}

I'll merge it to the main branch now because I need this file for setting up the GilabCI process, but I'll move this to "Needs Review" just in case someone has suggestions on this.

I'll move it to "Fixed" now, if anyone has any suggestions, please let me know and I'll re-open the issue.