adds 1.3 in hy

Author: Rony Reis

Diff for: 1.1-TheElementsOfProgramming/ex-1.3/reis-r.hy

@@ -0,0 +1,4 @@
+(defn square [x] (* x x))
+(defn answer [x y z]
+  (+ (square (get (sorted [x y z]) -1))
+     (square (get (sorted [x y z]) -2))))