feat: give more information for the exercise

Author: nik-rev

16_permutations/README.md

@@ -1,6 +1,6 @@
 # Exercise 16 - permutations
 
-Write a function that takes in an input array and returns an array of all possible permutations of the array
+Write a function that takes in an input array of an consecutive positive integers, starting at 1, and returns an array of all possible permutations of the original array
 
 ```javascript
 permutations([1,2,3]); // [[1,2,3],[1,3,2],[2,1,3],[2,3,1],[3,1,2],[3,2,1]]