Add exercises and commit template

.commit_template

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+
+
+# -----------------------------------------------------------------
+# Write your entire commit message above this line.
+# 
+# The first line should be a quick description of what you changed.
+# Then leave a blank line. 
+# Then, taking as many lines as you want, reflect on your experience with 
+# this lab. Write about whatever you want; here are a few suggestions: 
+# 
+# - How did this lab feel different from Unit 1? Did this kind of thinking
+#   feel familiar from other kinds of thinking you have done before?
+# - This lab asked you to use the Terminal in a very different way. 
+#   What was it like for you? Did you have any interesting ideas while you 
+#   worked on this lab? 
+# - Did you get stuck? In different ways from Unit 1? What strategies did you 
+#   use to get unstuck?
+# - Have you started giving help to peers or getting help from peers? Why or 
+#   why not?

exercises.md

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+# Exercises
+
+Answer the following questions (or at least as many as you can figure out) in this document. 
+For all the questions, use the 100k words. Give your answer for each exercise, and 
+show the command you used to get it. Each question can be answered using a single Terminal 
+command, though you might need to use a number of pipes. 
+
+If you want to be really stylish, put your code inside of backticks like this: 
+
+`cat words_100k.txt | length | put 10 | equal | count`
+
+## 1. What is the longest word?
+
+
+## 2. How many words have two u's in a row?
+
+
+## 3. How many words have the word "cat" in them?
+
+
+## 4. How many words have all five vowels (aeiou)?
+
+
+## 5. Which words have two l's in a row, two m's in a row, and two t's in a row? (they don't have to be in that order)
+
+
+## 6. How many words have sixteen or more letters?
+
+
+## 7. What's the most frequent 10-letter word?
+
+
+## 8. What's the longest word which doesn't have any repeated letters?
+
+
+## 9. What's the longest word which only uses four different letters?
+
+
+## 10. If you rearrange the letters in "sidebar," what other words can you create?
+
+