Creating the NewsScope enum

The NewsScope enum defines the different kinds of news that our service supports. Let's add it by following these few steps:

1. In the News project, create a new folder called Services.
2. In the Services folder, add a new file called NewsScope.cs.
3. Add the following code to that file:

namespace News.Services
{
    public enum NewsScope
    {
        Headlines,
        Local,
        Global
    }
}

To be able to use this enum in a switch expression, we'll need to enable C# 8 for the project.