How to execute example js in the README.md

[if-kyle]

Hello,

I am very new to node/npm and it took me a bit to figure out how execute/run the examples in the README. Likely obvious to those that run node all day, but hopefully this saves some time to other newbies.

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[ebidel]

I'm ok with adding this extra info if it's helpful for new comers. I think it's come up a few times already as people come into the project from a non-Node world :)