Addin Vue.js to project

<script
  src="https://unpkg.com/vue@3/dist/vue.global.js">
</script>

Example of VueJs

div id="app"></div>

<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>

<script>

  const app = Vue.createApp({
    data() {
      return {
        message: "Hello World!"
      }
    }
  })

 app.mount('#app')

</script>