Set Groups Vue app for Dashboard page

app/assets/javascripts/groups/index.js

+import Vue from 'vue';
+import GroupsStore from './stores/groups_store';
+
 $(() => {
-  // Groups bundle
-});
\ No newline at end of file
+  const groupsStore = new GroupsStore();
+
+  const GroupsApp = new Vue({
+    el: document.querySelector('.js-groups-list-holder'),
+    data: groupsStore,
+  });
+});

app/assets/javascripts/groups/stores/groups_store.js

+export default class GroupsStore {
+  constructor() {
+    this.groups = [];
+  }
+}

app/views/dashboard/groups/index.html.haml

@@ -2,6 +2,7 @@
 - header_title  "Groups", dashboard_groups_path
 = render 'dashboard/groups_head'
+= page_specific_javascript_bundle_tag('common_vue')
 = page_specific_javascript_bundle_tag('groups')
 - if @groups.empty?