add vue2 demo

packages/artplayer-template/vue.js/src/App.vue

@@ -1,31 +0,0 @@
-<template>
-    <Artplayer @get-instance="getInstance" :option="option" :style="style" />
-</template>
-
-<script>
-import Artplayer from './Artplayer.vue';
-
-export default {
-    data() {
-        return {
-            option: {
-                url: 'https://artplayer.org/assets/sample/video.mp4',
-                autoSize: true,
-            },
-            style: {
-                width: '600px',
-                height: '400px',
-                margin: '60px auto 0',
-            },
-        };
-    },
-    components: {
-        Artplayer,
-    },
-    methods: {
-        getInstance(art) {
-            console.log(art);
-        },
-    },
-};
-</script>