Add ES6 Examples to all chapters (#38)

* add ES6 example for binary search

* add ES6 example for selection sort

* add ES6 example for countdown

* add ES6 example for greet

* add ES6 example for factorial

* edit ES6 example for quicksort

* add ES6 example for loop sum

* add ES6 example for recursive sum

* add ES6 example for recursive count

* add ES6 example for recursive max

* add ES6 example for price of groceries

* add ES6 example for check voter

* add ES6 example for breadth-first search

* add ES6 example for dijkstras algorithm

* edit ES6 example for dijkstras algorithm

* edit ES6 example for set covering

* add ES6 example for longest common subsequence

09_dynamic_programming/ES6/examples/base.js

@@ -0,0 +1,9 @@
+const initializeMatrix = (rows, cols) => {
+  const matrix = [];
+  for (let i = 0; i < rows.length; i += 1) {
+    matrix.push(Array(cols.length).fill(0));
+  }
+  return matrix;
+};
+
+export default initializeMatrix;