add collections readme

Author: bbelderbos

days/04-06-collections/README.md

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+# Collections module
+
+## Day 1: Your new data structure friends
+
+Welcome to this lesson. Today you will learn about some powerful new data structures: `namedtuple`, `defaultdict`, `Counter` and `deque`.
+
+I prepared a [Jupyter notebook](https://github.com/talkpython/100daysofcode-with-python-course/blob/master/days/04-06-collections/collections.ipynb) so you can follow along with this lesson.
+
+## Day 2: Practice using movie data
+
+You get to use these new data structures I encourage you to code an exercise: [PyBites Code Challenge 13 - Highest Rated Movie Director](https://pybit.es/codechallenge13.html). 
+
+See the [notebook](https://github.com/talkpython/100daysofcode-with-python-course/blob/master/days/04-06-collections/collections.ipynb) for more info how to complete this exercise.
+
+You can also take a slimmed down version of this exercise [on our platform](https://codechalleng.es/bites/30/).
+
+## Day 3: More practice on your own data
+
+We challenge you to find your own data set and try to use the new collections data structures yourself.
+
+Stuck at finding examples? We used `collections` quite a bit for [when we did the 100 Days of Code](https://github.com/pybites/100DaysOfCode/blob/master/LOG.md):
+
+	$ python module_index.py |grep collections
+	collections        | stdlib | 001, 021, 023, 034, 036, 042, 045, 055, 057, 063, 076, 084, 086, 095, 096
+
+## Time to share what you've accomplished!
+
+Be sure to share your last couple of days work on Twitter or Facebook. Use the hashtag **#100DaysOfCode**.
+
+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.
+
+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).