Notifications interface (#5354)

Co-authored-by: Apoorv Mishra <apoorvmishra101092@gmail.com>

app/actions/definitions/notifications.tsx

@@ -0,0 +1,16 @@
+import { MarkAsReadIcon } from "outline-icons";
+import * as React from "react";
+import { createAction } from "..";
+import { NotificationSection } from "../sections";
+
+export const markNotificationsAsRead = createAction({
+  name: ({ t }) => t("Mark notifications as read"),
+  analyticsName: "Mark notifications as read",
+  section: NotificationSection,
+  icon: <MarkAsReadIcon />,
+  shortcut: ["Shift+Escape"],
+  perform: ({ stores }) => stores.notifications.markAllAsRead(),
+  visible: ({ stores }) => stores.notifications.approximateUnreadCount > 0,
+});
+
+export const rootNotificationActions = [markNotificationsAsRead];