Add push notifications overview documentation

Added an overview of push notifications as an experimental feature, including beta requirements and application instructions.

Author: stacy-qqq

versioned_docs/version-0.13/capabilities/notifications/notifications-overview.md

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+# Overview
+
+Push notifications are an experimental engagement feature designed to help bring players back into your game at the right moments.
+
+Push notifications can help drive engagement, increase player retention, and build habit loops for players—all good things for your game. You can trigger opt-in reminders around high-value events such as streaks, rewards availability, milestones, and live activities.
+
+## Beta requirements
+
+This is a **gated beta**, which means that you’ll need to apply to unlock the ability to use push notifications in your app. Current eligibility is aimed at established, already-engaged games rather than brand-new launches, and push notification partners are selected from active games with traction and predictable cadence. Check out our [featured games](https://www.reddit.com/r/GamesOnReddit/comments/1rydlny/games_launchpad/) to get an idea of what we’re looking for.
+
+## How to apply
+
+If you meet the beta requirements, fill out [this form](https://docs.google.com/forms/d/e/1FAIpQLScB3eXHVCBf3kyHueyf3G_raxH9_BsCGiXyGjQOOmPxWz6fEg/viewform?usp=publish-editor) for consideration, and be sure to include:
+
+- The app identifier.
+- Your push notification copy. We’ll do a quick review to ensure that it complies with our [Reddit Rules](https://redditinc.com/policies/reddit-rules).
+
+Note that spaces are limited, and not all apps that meet the criteria will be accepted.