Update README.md

README.md

@@ -6,6 +6,23 @@ A simple modal component for Vue.js
 
 ##Usage
 Example:
+
+main.js:
+```js
+import Vue from 'vue';
+import App from './App';
+import VueModal from '../src/index';
+
+Vue.use(VueModal);
+
+new Vue({
+  el: '#app',
+  template: '<App/>',
+  components: { App },
+});
+
+```
+App.vue:
 ```html
 <template>
   <div id="app">