Add text template for list_or_dict

README.md

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+# Dictionaries

list_or_dict.md

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+# List or dict?
+ 
+For each use case below, explain whether it would be better to store the data 
+in a `list` or in a `dict`. (Not all of these have a clear answer, so justify
+yours.)
+ 
+## Items you need to buy at the grocery store
+
+## Your friends' birthdays
+
+## Keeping track of RSVPs to a party
+
+## Your personal movie ratings
+
+## Temperature readings from a sensor
+
+## Messages in an email inbox
+
+## Git commits