Add assessment

assessment.md

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+# Riddles Lab Assessment
+
+Louis, 
+
+It looks like this lab isn't complete, but I'm wondering whether 
+you also took on a larger task than was required, as you started 
+implementing a client at the bottom of `api.py`, when the API
+methods that need to be implemented are called by the provided
+client in `client.py`.
+
+Chris