Added push notifications, FCM.

android/app/src/main/AndroidManifest.xml

@@ -7,6 +7,7 @@
     <uses-permission android:name="android.permission.WRITE_INTERNAL_STORAGE" />
 
     <application
+        android:name=".Application"
         android:label="Cake Wallet"
         android:allowBackup="false"
         android:fullBackupContent="false"
@@ -29,7 +30,6 @@
                 <category android:name="android.intent.category.LAUNCHER"/>
             </intent-filter>
         </activity>
-
         <meta-data
                 android:name="flutterEmbedding"
                 android:value="2" />