Add CoreWcf sample

[Renato Golia]

CoreWCF hit GA last week. Time to add a simple sample? :)

I could put up a simple PR for it.

[Dody Gunawinata]

I've never used them. If you have a simple sample, yes. Let's dedicate a section for CoreWCF.

[Dody Gunawinata]

Thanks for this PR. I added an entry for CoreWCF section at the front page.