[build template] add log4net to default template?

[ewilde]

I've been using crane init for quite a few projects.

The first thing I do is setup log4net on both the main project and unit test project.

• Add the log4net package
• Add App.config file {sigh}
• Copy sensible config files from https://github.com/ewilde/dotnet-playground/blob/master/logging/log4net-example/App.config
• forget to add [assembly: log4net.Config.XmlConfigurator(Watch = true)]!

Also be good to add to the default files in the projects

private static readonly ILog Log = LogManager.GetLogger(typeof(Calculator));