readme updated

readme.md

@@ -109,26 +109,40 @@ In this example:
 
 ## EventTarget as a global storage
 
+Demo: [BasketStorage](https://serikshaikamalov.github.io/lit-components/examples/basket/index.html)
+
 Why to use it?
 
 - A way of communication between components
 - Source of the truth
 - Implement subscriber/listener pattern
 
-Interface
+Usage
 
 ```js
-interface EventTarget {
-  addEventListener(
-    type: string,
-    callback: EventListenerOrEventListenerObject | null,
-    options?: AddEventListenerOptions | boolean
-  ): void;
-  dispatchEvent(event: Event): boolean;
-  removeEventListener(
-    type: string,
-    callback: EventListenerOrEventListenerObject | null,
-    options?: EventListenerOptions | boolean
-  ): void;
+/**
+ * This singleton EventEmitter can be used throughout your application to handle custom events.
+ */
+export class BasketStorage extends EventTarget {
+  items = [];
+  static instance;
+
+  static getInstance() {
+    if (!BasketStorage.instance) {
+      BasketStorage.instance = new BasketStorage();
+    }
+    return BasketStorage.instance;
+  }
+
+  addItem(item) {
+    this.items = [...this.items, item];
+    this.dispatchEvent(new CustomEvent("updated", { detail: { item } }));
+  }
+  getItems() {
+    return this.items;
+  }
 }
+
+const basketStorage = BasketStorage.getInstance();
+export default basketStorage;
 ```