Added Nevergreen Appsource

[ChristianOe]

Added Nevergreen Projekt (https://github.com/DanGough/Nevergreen) as AppSource. It's working like Evergreen and you can add Applications with the Syntax like Evergreen.

For example: Applist.json

"Apps": [
        {
            "IntuneAppName": "7-Zip",
            "IntuneAppNamingConvention": "AppName",
            "AppPublisher": "Igor Pavlov",
            "AppSource": "Nevergreen",
            "AppID": "7zip",
            "AppFolderName": "7zip",
            "FilterOptions": [
                {
                    "Architecture": "x64",
                    "Type": "msi"
                }
            ]
        }
  ]
}

[ChristianOe]

@AScott-WWF here is my pull request for your request #29 . You can easily add the changes to your project as long the maintainer does not implement my request.