Added fs_promise_demo.js to show how to use fs.promise API #16
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Added reference example of how to use the fs.promise API instead of the callback based API. The use of promises is becoming ubiquitous and while the tutorial mentions the synchronous methods, it doesn't mention the promise API based methods that are commonly used. My hope is that this example will show others how this API can be used to accomplish the same as in the fs_demo.js.