Add assessment

assessment.md

@@ -0,0 +1,16 @@
+# Tic Tac Toe Lab Assessment
+
+## Checkpoint 1
+Looks good. 
+
+## Checkpoint 2
+Looks good. 
+
+## Checkpoint 3
+Everything works as expected. Nice work!
+
+However, I don't quite agree with your claim that "The current and future 
+state demonstrates a 0 value, which implies that the game is as fair as 
+possible since it means an equal number of wins for X or O." You use 
+the language of propbability, but this is actually deterministic: if 
+each player plays perfectly, TTT will be a draw every time.