Add Notifications API

features/notifications-apps.yml

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+name: Notifications from service workers and installed apps
+# This feature is for the platform-specific nature of notifications support
+# in Chrome Android and Safari iOS, and anchors to the Caniuse feature.
+#
+# See `features/notifications.yml` for the full Notifications feature, which
+# does not align with Caniuse.
+description: Notifications via service worker registration's `showNotification()` method, sent from installed web applications (for example, saved to the Home Screen on Safari for iOS), show a message to the user, typically using the notification system of the host operating system.
+spec: https://notifications.spec.whatwg.org/
+caniuse: notifications
+status:
+  baseline: low
+  baseline_low_date: 2023-03-27
+  support:
+    chrome: "20"
+    chrome_android: "42"
+    edge: "14"
+    firefox: "22"
+    firefox_android: "22"
+    safari: "7"
+    safari_ios: "16.4"

features/notifications-apps.yml.dist

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+# Generated from: notifications-apps.yml
+# Do not edit this file by hand. Edit the source file instead!
+
+{}