Add useNotification documentation

Signed-off-by: soupette <cyril@strapi.io>

packages/core/helper-plugin/lib/src/hooks/useNotification/useNotification.stories.mdx

@@ -0,0 +1,48 @@
+<!--- useNotification.stories.mdx --->
+
+import { Meta } from '@storybook/addon-docs';
+
+<Meta title="hooks/useNotification" />
+
+# useNotification
+
+This component is used in order to apply RBAC to a view. If the user does not have the permissions to access the view he will be redirect to the homepage:
+
+## Usage
+
+```
+import { useNotification } from '@strapi/helper-plugin';
+import { Button, Main } from '@strapi/parts';
+
+const HomePage = () => {
+  const toggleNotification = useNotification();
+
+  const handleClick = () => {
+    toggleNotification({
+        // required
+        type: 'info|success|warning',
+        // required
+        message: { id: 'notification.version.update.message', defaultMessage: 'A new version is available' },
+        // optional
+        link: {
+          url: 'https://github.com/strapi/strapi/releases/tag/v4',
+          label: {
+            id: 'notification.version.update.link',
+            defaultMessage: 'See more'
+          },
+        },
+        // optional: default = false
+        blockTransition: true,
+        // optional
+        onClose: () => localStorage.setItem('STRAPI_UPDATE_NOTIF', true),
+      });
+  }
+
+  return (
+    <Main>
+      <h1>This is the homepage</h1>
+      <Button onClick={handleClick}>Display notification</Button>
+    </Main>
+  );
+};
+```