update readme

add `POST_NOTIFICATIONS` permission for android 13+

Author: scottmconway

README.md

@@ -3,15 +3,28 @@ Notifikator
 
 This is an Android application that catches every notification and forwards them to an HTTP endpoint.
 
-It natively supports talking to the [Kodi](https://kodi.tv/) JSON-RPC interface, [Notifications for Android TV](https://play.google.com/store/apps/details?id=de.cyberdream.androidtv.notifications.google), as well as sending plain JSON.
+It natively supports talking to the [Kodi](https://kodi.tv/) JSON-RPC interface, [Notifications for Android TV](https://play.google.com/store/apps/details?id=de.cyberdream.androidtv.notifications.google), [Gotify](https://gotify.net/), as well as sending plain JSON.
 
 How to Use
 ----------
 
 1. Install the application.
 2. Enable notification access (a shortcut is provided within).
 3. Configure the HTTP endpoint, protocol and authentication if necessary (see next section).
-4. *(Optional)* Send a test notification.
+4. *(Optional)* Configure the package denylist to silence noisy packages
+5. *(Optional)* Send a test notification.
+
+Package Denylist
+---------
+In order to deny specific applications from having their notifications forwarded, first get a list of your packages. This is simply obtained from running `adb shell pm list packages`. Applications' package names are also shown under the application's settings in the system settings application.
+
+Format your package names in a text file with one package name per line. Remove the `package:` prefix if copy-pasting from the output of `pm list packages`. If generating this on a computer, `adb push` can be used to send this text file to your android device.
+
+Click `Package Denylist File` in the app and select your denylist file.
+
+Changes to the content of this file won't be automatically detected by the app - you must reload the file for any changes to take effect.
+
+The packages specified in the denylist need not be installed on the device - they simply won't do anything if the given package never sends a notification.
 
 Protocols
 ---------
@@ -40,6 +53,10 @@ This protocol forwards the notification to the server part of the [Notifications
 
 The endpoint URL should look like `http://hostname:7676/`, and authentication should not be enabled.
 
+### Gotify
+
+This protocol simply POSTs a formatted JSON to the supplied URL. It expects a Gotify server's URL in this format: `https://gotify.example.com/message?token=$APP_TOKEN`. As of now, the `title` parameter is hard-coded to `Notifikator`, and `priority` to `5`.
+
 ### JSON
 
 This protocol will simply `POST` a JSON containing the notification title, text, small and large icons to an arbitrary endpoint. This is designed for people who want to write their own server code to handle it.
@@ -57,4 +74,4 @@ Here is an example JSON, note that any of the fields not present in the original
         "icon": "data:image/png;base64,..."
     }
 }
-```
+```

client/src/main/AndroidManifest.xml

@@ -2,6 +2,8 @@
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
 
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
+
     <application
         android:allowBackup="true"
         android:label="@string/app_name"