Add Node Profiling workout

[lizTheDeveloper]

Create a workout to cover the following objective:

• Use node memory profiling tools to detect memory leaks in a JavaScript program

I'm talking about node --expose-gc myScript.js --logHeapUsage and other tools. I'd like a workout that focuses on using the tools built into node for finding memory leaks.

If there is an open-source exercise or videos, make sure to add them to the links area, because this is a very hands-on task that people would need to practice to understand.