Update readme with I/O outputs

README.md

@@ -75,3 +75,15 @@ File `guard.hs`
 ### Slide 50
 
 `prime.hs` with function `primeinf`.
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+### Slide 55
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+`io_rev.hs` and `io_shuffle.hs` to compile
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+### Slide 57
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+`io_length.hs` to compile
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+### Slide 58
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+`io_cesar.hs` to compile