Add assessment

assessment.md

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+# Game Project Assessment
+
+Tom, 
+
+Fantastic! I love the way the laser flies; I can easily imagine the next steps here
+to get the space invaders to shuffle back and forth and gradually descend. One thing 
+I found less fluid was the need to push left-left-left to move the ship back and forth. 
+Retro doesn't support checking whether a key remains pushed down, but you could consider 
+implementing a sort of velocity, where the left and right arrows accelerate the ship 
+horizontally, and it keeps drifting left or right until it's stopped. 
+
+Nice work! This is definitely enough to get credit for the course; I'm happy to support
+you if you decide to go forward with a "remastered director's cut"
+
+Chris