Add assessment

assessment.md

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+# Game Project Assessment
+
+Danielle, 
+
+What a lovely little game! I've never seen a game like it, and the mechanic of pre-planning
+the plane's route works so well. If I were going to suggest areas to work on, the 
+`PlaneAgent`'s methods seem a bit heavy and repetitive--could you abstract out common
+behavior for all the different cases?
+
+This is really nice--with some more polishing, I think you'd have an addictive little Terminal 
+game :)
+
+-Chris
+