Add solution on js for 1287

Author: Gapur

solution/1287. Element Appearing More Than 25% In Sorted Array/README.md

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+1287. Element Appearing More Than 25% In Sorted Array
+
+Given an integer array sorted in non-decreasing order, there is exactly one integer in the array that occurs more than 25% of the time.
+
+```Javascript
+const findSpecialInteger = function(arr) {
+  let count = 0;
+  let item = -1;
+  for (var i = 0; i < arr.length; i++) {
+      if (item == arr[i]) {
+          count++;
+      } else {
+          item = arr[i];
+          count = 1;
+      }
+      if (count > arr.length * 0.25) {
+          return item;
+      }
+  }
+  return item;
+};
+```

solution/1287. Element Appearing More Than 25% In Sorted Array/Solution.js

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+const findSpecialInteger = function(arr) {
+  let count = 0;
+  let item = -1;
+  for (var i = 0; i < arr.length; i++) {
+      if (item == arr[i]) {
+          count++;
+      } else {
+          item = arr[i];
+          count = 1;
+      }
+      if (count > arr.length * 0.25) {
+          return item;
+      }
+  }
+  return item;
+};