Add push notification documentation

docs/guides/developing-antmedia-server/push-notification-management/Android SDK/_category_.json

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+{
+  "label": "Push Notification Management in Ant Media Server Android SDK",
+  "position": 2,
+  "link": {
+    "type": "generated-index",
+    "description": "Introduction to push notification management in Ant Media Server Android SDK"
+  }
+}

docs/guides/developing-antmedia-server/push-notification-management/Android SDK/configure-ant-media-server.md

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+---
+title: Configure Ant Media Server 
+description: Sending Notification in Android Tutorial
+keywords: [Push Notification Management Tutorial, Push Notification Management, Ant Media Server Documentation, Ant Media Server Tutorials]
+sidebar_position: 6
+---
+
+# Configure Ant Media Server:
+
+After you register FCM or APN, you will have the private key. You need to save it into the Ant Media Server. Open the management panel, select an application, and go to the application-level settings. You will see it in the push notification section.
+
+![](@site/static/img/push-notification-settings.jpg)
+
+To protect the send push notification WebSocket message, you need to generate two subscriber authentication tokens with the sender’s Subscriber ID and the receiver’s Subscriber ID. You can call the [getSubscriberAuthenticationToken](https://antmedia.io/rest/#/default/getSubscriberAuthenticationToken) Rest API endpoint. We will call the sender’s token as authToken in the rest of the documentation. We will call the sender’s Subscriber ID as subscriberId and we will call the receiver’s Subscriber ID as sendNotificationToSubscriber.

docs/guides/developing-antmedia-server/push-notification-management/Android SDK/configure-manifest.md

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+---
+title: Configure Manifest 
+description: Sending Notification in Android Tutorial
+keywords: [Push Notification Management Tutorial, Push Notification Management, Ant Media Server Documentation, Ant Media Server Tutorials]
+sidebar_position: 4
+---
+
+# Configure AndroidManifest.xml:
+
+- Open your AndroidManifest.xml file.
+- Add the necessary permissions and service declarations:
+
+```xml
+<service
+    android:name=".AntMediaFirebaseMessagingService.java"
+    android:exported="false">
+    <intent-filter>
+        <action android:name="com.google.firebase.MESSAGING_EVENT" />
+    </intent-filter>
+</service>
+```

docs/guides/developing-antmedia-server/push-notification-management/Android SDK/create-android-project.md

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+---
+title: Create an Android App Project in Android Studio 
+description: Sending Notification in Android Tutorial
+keywords: [Push Notification Management Tutorial, Push Notification Management, Ant Media Server Documentation, Ant Media Server Tutorials]
+sidebar_position: 2
+---
+
+## Step 2: Create an Android App Project in Android Studio
+
+- Open Android Studio and create a new project with No Activity.
+
+![](@site/static/img/sdk-integration/android-sdk/android-new-project-page.png)
+
+- Select No Activity and then click Next.
+
+![](@site/static/img/sdk-integration/android-sdk/android-project-naming-screen.png)
+
+- Give your application a name, and then click Finish. We will call it
+  `MyWebRTCStreamingApp`.
+
+Congratulations! You have successfully created your WebRTC Android SDK application project.