Adding settings to config file in .NET Core

[im1dermike]

I have SeriLog working in my .NET Core web app. I've configured it in my Startup class like this:

Log.Logger = new LoggerConfiguration()
    .MinimumLevel.Debug()
    .WriteTo.RollingFile("C:/LogFiles/log-{Date}.txt")
    .CreateLogger();

I'd like to pull out configuration properties like the min log level and rolling file path to a file. In .NET Core, it would seem either the appsettings.json file or web.config file would be appropriate. In my project, I have these environment-specific versions for these files.

How can I move configuration properties to a config file in .NET Core?