feat: added vue examples

This PR includes Vue examples, in particular:
- Vue Spa
- Vue Spa + Router
- Vue using Sever Side Rendering with Express.js.

Also updated the general Readme.

vue/spa/src/main.ts

@@ -0,0 +1,8 @@
+import './assets/main.css'
+
+import { createApp } from 'vue'
+import App from './App.vue'
+
+const app = createApp(App)
+
+app.mount('#app')