Add docker/docker-compose support for examples

[Berezhnyk]

Add docker/docker-compose support for examples.

[lucabriguglia]

Thanks for the suggestion, are you able to help?

[andreujuanc]

There is nothing special to do in a Kledex application, compared a regular dotnet one.
Following the official docs might be enough: https://docs.docker.com/engine/examples/dotnetcore/
BUT, I still think that having a docker example in the wiki might help get some traction. :)

[Ilchuk-Mihail]

@lucabriguglia I can help with this :)

[lucabriguglia]

@Ilchuk-Mihail that would be great, thanks :-)

[Ilchuk-Mihail]

I have started building this. Should I only run that examples in docker or it should be docker compose to run also database? With sql server, I think everything will be ok, but not sure about cosmos db. I don't see any ways to build it in docker compose so far. What do you think?

[lucabriguglia]

I would start simple and then add stuff where possible