Serilog.Sinks.Console.LogThemes - Custom themes and easier theme building

[JasonLandbridge]

Hi there 👋,

Several days ago I posted #138 and I have created the package I was talking about:

Serilog.Sinks.Console.LogThemes

@nblumhardt, would you be so kind to test it out and let me know what you think?

Feedback is very welcome!

Thanks for the idea!