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?