feat: add groups view page (notes-tab) (#789)

Fixes: #778

src/app/groups/common-resolvers/group-notes.resolver.ts

@@ -0,0 +1,32 @@
+/** Angular Imports */
+import { Injectable } from '@angular/core';
+import { Resolve, ActivatedRouteSnapshot } from '@angular/router';
+
+/** rxjs Imports */
+import { Observable } from 'rxjs';
+
+/** Custom Services */
+import { GroupsService } from '../groups.service';
+
+/**
+ * Group Notes data resolver.
+ */
+@Injectable()
+export class GroupNotesResolver implements Resolve<Object> {
+
+  /**
+   * @param {GroupsService} GroupsService Groups service.
+   */
+  constructor(private groupsService: GroupsService) { }
+
+  /**
+   * Returns the Group's Notes data.
+   * @param {ActivatedRouteSnapshot} route Route Snapshot.
+   * @returns {Observable<any>}
+   */
+  resolve(route: ActivatedRouteSnapshot): Observable<any> {
+    const groupId = route.parent.paramMap.get('groupId');
+    return this.groupsService.getGroupNotes(groupId);
+  }
+
+}