Create sample module using vertx-rx-java

Thanks, @Ann-Marie Breaux, we sure can close such stories by ourselves , but we'll discuss it in the next meeting.

Thanks, @Kateryna Senchenko I remember the info at the standup (except I don't really understand it, but that's totally OK!). Just couldn't remember if we needed any other signoff. For these technical stories, it might be worth discussing whether the team can just close them, or if I need to. I'm not sure I really add much value to these types of stories.

Hi @Ann-Marie Breaux, yes, we reviewed it with the team internally and I showed the results on the stand-up yesterday as well.

Hi @Kateryna Senchenko I think you told me, but I forgot. The team reviewed this, and all is good - right? I'm definitely not qualified to review it! I'm closing it.

Sample module that uses rx-java can be found in the repo mod-sample-rx. The brief overview was added on the wiki page.