add traefik config example

[Xenion1987]

This is a generalized version of the traefik service I am using for my setup.

[turbo124]

@Xenion1987 thanks for this! We've had lots of queries about configuring Traefik!

[Xenion1987]

You're team is doing a very good job, so If I can, I will return the favor.

I'll try to add some more examples using different CertResolvers. I know not everybody ist using Cloudflare to get dns01-challenge to work.

[turbo124]

Thanks!