Add example for subscribing to multiple topics

[bputt]

I posted the question to SO: https://stackoverflow.com/questions/56535113/kafka-streams-listening-to-multiple-topics-hangs

It would be helpful if there was an example of how to properly stream multiple topics IN and do some processing and have the data go to various output streams based on some if/then scenario

[OneCricketeer]

There's nothing particularly interesting about the difference between these as long as you want the topology to be the exact same between every topic

• stream(String topic)
• stream(Pattern topicPattern)
• stream(Collection<String> topics)

If you want to go to various output topics, then the docs already include example of branch operator