.hs -> .cr

update examples

examples/sumList.cr

@@ -0,0 +1,12 @@
+{-# PackData Nil  0 0 #-}
+{-# PackData Cons 1 2 #-}
+
+foldr f z l = case l of
+    { Nil       -> z
+    ; Cons x xs -> f x (foldr f z xs)
+    };
+
+list = Cons 1 (Cons 2 (Cons 3 Nil));
+
+main = foldr (+#) 0 list;
+