Add how to use nodeJS to run snippets of code found in Stack Exchange

[kvutien]

I'd have a suggestion in Module 1, "How to ask a question"

How about adding a short section how to use node index.js as a REPL, where index.js is a snippet of code, to test the answers of people to a Stack Exchange question. Some answers are good, some answers give a general idea but their snippet of code is buggy. So it's better to test it separately first, instead of including it immediately in your own code to test.

Also, many tutorials assume the reader knows how to run the snippets of code. Like this one about OrbitDB