reorg and add code for second edition

11_dynamic_programming/javascript/examples/base.js

@@ -0,0 +1,7 @@
+module.exports = function initialize_matrix(rows, cols) {
+  let matrix = [];
+  for (let i = 0; i < rows.length; i++) {
+    matrix.push(Array(cols.length).fill(0));
+  }
+  return matrix;
+};