Resolve "Fix splash screen"

Closes #23 (closed)

android/app/src/main/res/drawable-v21/launch_background.xml

 <?xml version="1.0" encoding="utf-8"?>
-<!-- Modify this file to customize your launch splash screen -->
 <layer-list xmlns:android="http://schemas.android.com/apk/res/android">
     <item android:drawable="?android:colorBackground" />
 
-    <!-- You can insert your own image assets here -->
-    <!-- <item>
+    <item>
         <bitmap
             android:gravity="center"
             android:src="@mipmap/launch_image" />
-    </item> -->
+    </item>
 </layer-list>