For testing purposes, unashamedly stealing from https://github.com/MassTransit/Sample-Courier/blob/master/src/Client/Program.cs

ConfigureLogger.cs

static void ConfigureLogger()
        {
            const string logConfig = @"<?xml version=""1.0"" encoding=""utf-8"" ?>
<log4net>
  <root>
    <level value=""INFO"" />
    <appender-ref ref=""console"" />
  </root>
  <appender name=""console"" type=""log4net.Appender.ColoredConsoleAppender"">
    <layout type=""log4net.Layout.PatternLayout"">
      <conversionPattern value=""%m%n"" />
    </layout>
  </appender>
</log4net>";

            using (var stream = new MemoryStream(Encoding.UTF8.GetBytes(logConfig)))
            {
                XmlConfigurator.Configure(stream);
            }
        }