ASP.NET Core example to show how to return a CloudEvent

[meteatamel]

The ASP.NET Core example shows how to receive and a CloudEvent. However, there's no example to show how to return a CloudEvent from a controller. I've been trying to figure this out with no success so far. A sample would be quite helpful.

[jskeet]

We can do better than an example... we should have an extension method of:

public static CopyToHttpResponse(
    this CloudEvent cloudEvent,
    HttpResponse response,
    ContentMode contentMode,
    CloudEventFormatter eventFormatter)

... and probably the same for CopyToHttpRequest as well. Shouldn't be terribly hard to do that, given the other implementations we've got.

[jskeet]

This is now covered in #148 as a broader review of HTTP method availability.