controller return json to vue via twig; init vue App

src/Bundle/ChillActivityBundle/Resources/public/vuejs/Activity/index.js

@@ -0,0 +1,16 @@
+import { createApp } from 'vue';
+import { _createI18n } from 'ChillMainAssets/vuejs/_js/i18n'
+import { appMessages } from './i18n'
+import store from './store'
+
+import App from './App.vue';
+
+const i18n = _createI18n(appMessages);
+
+const app = createApp({
+   template: `<app></app>`,
+})
+.use(store)
+.use(i18n)
+.component('app', App)
+.mount('#activity');