add day15

day15/src/main.js

@@ -0,0 +1,11 @@
+import { Reactive } from './lib/ReactiveObject'
+import { getCookie } from './lib/cookieManager';
+
+export const appState = new Reactive({
+    count: 0,
+    cookie: getCookie('username'),
+    text: '',
+    html: '',
+    year: '',
+    cookiedata: "",
+});