JS - setup itertools folder hierarchy

Author: hobojoe1848

days/19-21-itertools/README.md

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+# Days 19-21: Itertools
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+## Day N: Watch videos and <x>!
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+## Day N+1: <x>
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+## Day N+2: Your Turn!
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+### Time to share what you've accomplished!
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+Be sure to share your last couple of days work on Twitter or Facebook. Use the hashtag **#100DaysOfCode**. 
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+Here are [some examples](https://twitter.com/search?q=%23100DaysOfCode) to inspire you. Consider including [@talkpython](https://twitter.com/talkpython) and [@pybites](https://twitter.com/pybites) in your tweets.
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+*See a mistake in these instructions? Please [submit a new issue](https://github.com/talkpython/100daysofcode-with-python-course/issues) or fix it and [submit a PR](https://github.com/talkpython/100daysofcode-with-python-course/pulls).*