Add composer.json file to the project

I added the file, looks ok to me, I'll move it to "Needs Review" for extra set of eyes.

Thanks

{
  "name": "drupal/sagepay",
  "type": "drupal-module",
  "keywords": ["Drupal", "Ubercart"],
  "description": "This is a payment gateway for Ubercart ported to drupal 8 version, built with Ubercart 8.4.x.",
  "homepage": "https://www.drupal.org/project/sagepay",
  "authors": [
    {
      "name": "Adrian ABABEI (web247)",
      "homepage": "https://www.drupal.org/u/web247",
      "role": "Maintainer"
    },
    {
      "name": "Nicolae Procopan",
      "homepage": "https://www.drupal.org/u/thebumik",
      "role": "Maintainer"
    }
  ],
  "support": {
      "issues": "https://www.drupal.org/project/issues/sagepay",
      "source": "https://git.drupalcode.org/project/sagepay"
  },
  "license": "GPL-2.0-or-later",
  "minimum-stability": "dev",
  "require": {
    "php": ">=8.1",
    "drupal/core": "^8.8 || ^9"
  }
}

I'll move it to "Fixed" for now.

Automatically closed - issue fixed for 2 weeks with no activity.