Add assessment

assessment.md

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+method = "quality"
+possible = 100
+score = 100
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+
+Great! I like how you created helper functions and then used them to break down 
+the work of drawing the letters. I imagine you could have created another layer
+of helper functions too--the helper functions here are still thinking at the level 
+of "move the turtle around;" the next level up might be more at the level of 
+"draw parts of letters," and could have functions based on common parts of letters.