Create Distinct.md

Distinct.md

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+# [Distinct](https://codility.com/programmers/lessons/6-sorting/)
+Compute number of distinct values in an array.
+
+### Solution (JavaScript)
+If we sort the array then we are simply able to step through it and keep a counter of every time a new number is encountered.
+
+__[Test Score: 100%](https://codility.com/demo/results/trainingECATBF-VJK/)__
+
+```js
+function solution(A) {
+    A.sort((a,b) => a-b)
+    let count = 0
+    let previous = null
+    A.forEach((e)=> {
+        if (previous !== e) {
+            count++
+            previous = e
+        }
+    })
+
+    return count
+}
+```