announcement for shutting down the system

resources/assets/js/pages/auth/login.vue

@@ -2,6 +2,13 @@
   <div class="container">
     <div class="row">
       <div class="col-lg-8 m-auto">
+        <div class="alert alert-danger" role="alert">
+          Dear EXCHANGE users,<br>
+          Please note that we will be experiencing server downtime on the 17<sup>th</sup> June 2021, from 7:00 am until 9:00 am due to routine maintenance.<br>We apologise in advance for any inconvenience that may be caused<br><br>
+          尊贵的EXCHANGE用户<br>
+          EXCHANGE 系统将在 2021年 6月 17日 ， 早上 7点 至 9点 开始进行维修。<br>
+          如有不便， 敬请原谅。
+        </div>
         <card :title="$t('login')">
           <form @submit.prevent="login" @keydown="form.onKeydown($event)">
             <!-- Email -->