adding Productivity app Category

app/src/main/AndroidManifest.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<manifest
-    xmlns:android="http://schemas.android.com/apk/res/android"
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.simplemobiletools.filemanager.pro"
     android:installLocation="auto">
 
@@ -15,6 +14,7 @@
     <application
         android:name=".App"
         android:allowBackup="true"
+        android:appCategory="productivity"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_launcher_name"
         android:requestLegacyExternalStorage="true"