Added splash screens to some of the Android demos

Samples/Android/CatapultWarsNet/Resources/values/Styles.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+  <style name="Theme.Splash" parent="android:Theme">
+    <item name="android:windowBackground">@drawable/splash</item>
+    <item name="android:windowNoTitle">true</item>
+  </style>
+</resources>

Samples/Android/Orientation/Resources/values/Styles.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+  <style name="Theme.Splash" parent="android:Theme">
+    <item name="android:windowBackground">@drawable/splash</item>
+    <item name="android:windowNoTitle">true</item>
+  </style>
+</resources>