fix(guide): simplify directory structure

guide/english/javascript/tutorials/add-new-properties-to-a-javascript-object/index.md

@@ -0,0 +1,23 @@
+---
+title: Add New Properties to a JavaScript Object
+---
+
+You can add new properties to existing JavaScript objects the same way you would modify them.
+
+There are two different syntaxes, dot notation and bracket notation. Dot notation is generally preferred for readability but properties must be a valid identifier.
+
+Here is how using dot notation:
+
+    myDog.bark = "woof-woof";
+
+Here is how using bracket notation:
+```javascript
+myObject['bark'] = "woof-woof";
+```
+
+Using bracket notation, we can utilize variables as property names:
+
+```javascript
+var dynamicProperty = "bark";
+myObject[dynamicProperty] = "woof-woof";
+```