added new code challenge readme

bbelderbos · bbelderbos · commit b4680b8685f0 · 2018-10-23T10:48:42.000+02:00
diff --git a/56/README.md b/56/README.md
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+## Code Challenge 56 - Calculate the Duration of a Directory of Audio Files
+
+* Take the challenge [on our platform](https://codechalleng.es/challenges/56) 

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	`1`	`+## Code Challenge 56 - Calculate the Duration of a Directory of Audio Files`
	`2`	`+`
	`3`	`+* Take the challenge [on our platform](https://codechalleng.es/challenges/56)`