add basic view app

src/App.vue

@@ -0,0 +1,31 @@
+<template>
+  <div class="hello-world">
+    <h1>Welcome to Vue.js</h1>
+    <p>Counter: {{ count }}</p>
+  </div>
+</template>
+
+<script>
+  export default {
+    name: 'app',
+    data() {
+      return {
+        count: 0
+      };
+    },
+    mounted() {
+      this.interval = setInterval(() => {
+        this.count += 1;
+      }, 1000);
+    },
+    destroyed() {
+      clearInterval(this.interval);
+    }
+  }
+</script>
+
+<style>
+  body {
+    background-color: #eee;
+  }
+</style>

src/main.js

@@ -1,3 +1,6 @@
-/* eslint-env browser */
+import Vue from 'vue';
+import App from './App.vue';
 
-document.querySelector('#app').innerHTML = 'Hello, from main.js!';
+new Vue({
+  render: h => h(App),
+}).$mount('#app');