3_b_9: Add solution

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diff --git a/ch03/3_b_9.hs b/ch03/3_b_9.hs
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+-- Consider three two-dimensional points a, b, and c. If we look at the angle
+-- formed by the line segment from a to b and the line segment from b to c, it
+-- either turns left, turns right, or forms a straight line. Define a Direction
+-- data type that lets you represent these possibilities.
+
+data Direction = DLeft
+               | DRight
+               | DStraight
+               deriving (Show)