Create drop-right.md

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+### Array dropRight
+
+Returns a new array with `n` elements removed from the right
+
+Checks if `n` is shorter than the given array and slices it accordingly or returns an empty array
+
+```js
+const dropRight = (arr, n = 1) => (arr.length - n ) > 0 ? arr.slice(0, arr.length - n) : []
+
+//dropRight([1,2,3]) -> [1,2]
+//dropRight([1,2,3], 2) -> [1]
+//dropRight([1,2,3], 42) -> []
+```