recorder example for node application

[blandocs]

There is java and javascript browser example about recorder.
But I can't find using node application.
So I make this example for people!

Thank you :)

[jenkinskurento]

Hi there. Thanks for your PR.

I'm waiting for a Kurento member to verify that this patch is reasonable to test. If it is, they should reply with check out please on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

[jenkinskurento]

There were no errors, go have a cup of coffee...