SOURCE

new Vue({
  el:'#app',
  data(){
    return {
      lists:[{
        name:'',
        title:''
      }]
    }
  },
  methods:{
    add(){
      this.lists.push({
         name:'',
        title:''
      })
    }
  }
})

<div id="app">
  {{lists}}
  <ul>
    <template v-for="item of lists">
      <li>
        <input v-model="item.name" type="text"> 
        <input v-model="item.title"  type="text">
      </li>
    </template>
  </ul>
  <button @click="add">add</button>
  
  
  
</div>