Add SplashScreenUntilFirstFrame

Author: ditman

packages/package_info/example/android/app/src/main/AndroidManifest.xml

@@ -9,6 +9,9 @@
                   android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection"
                   android:hardwareAccelerated="true"
                   android:windowSoftInputMode="adjustResize">
+            <meta-data
+                android:name="io.flutter.app.android.SplashScreenUntilFirstFrame"
+                android:value="true" />
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
                 <category android:name="android.intent.category.LAUNCHER"/>