controller return json to vue via twig; init vue App

src/Bundle/ChillActivityBundle/Resources/public/vuejs/Activity/App.vue

@@ -0,0 +1,18 @@
+<template>
+  hello
+</template>
+
+<script>
+import { mapState } from 'vuex';
+
+export default {
+   name: "App",
+   components: {},
+   computed: mapState([
+      'activity'
+   ])
+}
+</script>
+
+<style lang="scss" scoped>
+</style>