Add notifications overview (#414)

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/frontend/pulls/414
Co-authored-by: konrad <konrad@kola-entertainments.de>
Co-committed-by: konrad <konrad@kola-entertainments.de>

src/services/notification.js

@@ -0,0 +1,22 @@
+import AbstractService from '@/services/abstractService'
+import {formatISO} from 'date-fns'
+import NotificationModel from '@/models/notification'
+
+export default class NotificationService extends AbstractService {
+	constructor() {
+		super({
+			getAll: '/notifications',
+			update: '/notifications/{id}',
+		})
+	}
+
+	modelFactory(data) {
+		return new NotificationModel(data)
+	}
+
+	beforeUpdate(model) {
+		model.created = formatISO(new Date(model.created))
+		model.readAt = formatISO(new Date(model.readAt))
+		return model
+	}
+}