docs: how to send notifications to admin dashboard panel (#13231)

* docs: how to send admin-ui notifications

* Apply suggestions from code review

Co-authored-by: Shahed Nasser <shahednasser@gmail.com>

---------

Co-authored-by: Shahed Nasser <shahednasser@gmail.com>

www/apps/resources/app/infrastructure-modules/notification/local/page.mdx

@@ -74,3 +74,71 @@ module.exports = defineConfig({
     </Table.Row>
   </Table.Body>
 </Table>
+
+---
+
+## Send Notifications to the Admin Notification Panel
+
+The Local Notification Module Provider can also be used to send notifications to the [Medusa Admin's notification panel](!user-guide!#check-notifications). 
+You can send notifications to the admin dashboard when a certain action occurs using a subscriber, a custom workflow or a workflow hook.
+
+For example, to send an admin notification whenever an order is placed, create a [subscriber](!docs!/learn/fundamentals/events-and-subscribers) at `src/subscribers/order-placed.ts` with the following content:
+
+export const highlights = [
+  ["11", "notificationModuleService", "Resolve the Notification Module."],
+  ["13", "createNotifications", "Create the notification to be sent."],
+  [
+    "15",
+    '"feed"',
+    "By specifying the `feed` channel, the Local Notification Module Provider will be used to send the notification.",
+  ],
+  ["16", '"admin-ui"', "The ID of the template used for admin dashboard notifications"],
+  ["17", "data", "The data for the notification. It must contain `title` and `description` properties."],
+]
+
+```ts title="src/subscribers/order-placed.ts" highlights={highlights} collapsibleLines="1-6" expandButtonLabel="Show Imports"
+import type {
+  SubscriberArgs,
+  SubscriberConfig,
+} from "@medusajs/framework"
+import { Modules } from "@medusajs/framework/utils"
+
+export default async function orderPlacedHandler({
+  event: { data },
+  container,
+}: SubscriberArgs<{ id: string }>) {
+  const notificationModuleService = container.resolve(Modules.NOTIFICATION)
+
+  await notificationModuleService.createNotifications({
+    to: "",
+    channel: "feed",
+    template: "admin-ui",
+    data: {
+      title: "New order",
+      description: `A new order has been placed`,
+    },
+  })
+}
+
+export const config: SubscriberConfig = {
+  event: "order.placed",
+}
+```
+
+In this subscriber, you:
+
+- Resolve the Notification Module's main service from the [Medusa container](!docs!/learn/fundamentals/medusa-container).
+- Use the `createNotifications` method of the Notification Module's main service to create a notification to be sent to the admin dashboard. By specifying the `feed` channel, the Local Notification Module Provider is used to send the notification.
+- The `template` property of the `createNotifications` method's parameter must be set to `admin-ui`.
+- The `data` property allows you to customize the content of the admin notification. It must contain `title` and `description` properties.
+
+### Test Sending Notification
+
+To test this out, start the Medusa application:
+
+```bash npm2yarn
+npm run dev
+```
+
+Then, place an order. The subscriber will run, sending a notification to the Medusa Admin's notification panel.
+