index.hbs

<div class="selected-users">
  {{#draggable-dropzone dropped="addUser"}}
    <ul class="selected-users-list">
      {{#each user in selectedUsers}}
        <li>{{user.fullName}}</li>
      {{/each}} 
    </ul>
  {{/draggable-dropzone}}
</div>

<div class="available-users">
  {{#each user in users}}
    {{#draggable-item content=user.id}}
      <span>{{user.fullName}}</span>
    {{/draggable-item}}
  {{/each}}
</div>