Add assessment

assessment.md

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+method = "completion"
+score = "complete"
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+Great--I thought your real-world examples of the difference between 
+values and names were helpful. 
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+Your discussion of functions focused on "break[ing] up the work."
+True--functions are great for this--but come back to this idea when 
+we get to Unit 2, as we'll think about functions very differently.