Add assessment

assessment.md

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+# Dice Lab Assessment
+
+Checkpoints 1 and 2 look good. Checkpoint 3 doesn't appear to be done--I can come 
+back to this if you finish this up (or just need to `mwc submit`)
+
+## Checkpoint 1
+
+Using Counter was effective, although `is_three_of_a_kind`
+fails with [1, 1, 1, 1, 1]. You could simplify further with 
+some additional idiomatic python:
+
+```
+def is_three_of_a_kind(self):
+    return max(Counter(self.faces())) >= 3
+```
+
+`is_four_of_a_kind` has a similar bug.
+
+## Checkpoint 2
+The content of your docstrings looks good. However, most are above their function
+rather than inside it. This technically works, but defeats some of the purpose of 
+docstrings, as there are automated tools that use them and expect to find them in 
+the right place. 
+
+## Checkpoint 3
+Not done.