added admin (group, user) interface components

src/components/User.vue

@@ -0,0 +1,47 @@
+<!-- components/User.vue -->
+<template>
+    <div>
+        <section class="hero is-primary">
+            <div class="hero-body">
+                <div class="container has-text-centered">
+                    <h3 class="title">Manage users</h3>
+
+                    <p class="subtitle error-msg">{{ errorMsg }}</p>
+                </div>
+            </div>
+        </section>
+
+    </div>
+</template>
+
+<script>
+    import { EventBus } from '@/utils'
+    import {getRemainingJwtValiditySeconds} from "../utils";
+
+    export default {
+        data () {
+            return {
+                users: '',
+                errorMsg: '',
+            };
+        },
+        methods: {
+
+        },
+        mounted () {
+
+        },
+        beforeDestroy () {
+        },
+        computed: {
+
+        },
+    }
+</script>
+
+<style lang="scss">
+    .error-msg {
+        color: red;
+        font-weight: bold;
+    }
+</style>