Added splash screen

app/src/main/res/drawable/background_splash.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <item android:drawable="@android:color/white" />
+
+    <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@drawable/splash"/>
+    </item>
+
+</layer-list>

app/src/main/res/values/styles.xml

@@ -6,6 +6,10 @@
         <item name="colorAccent">@color/colorAccent</item>
     </style>
 
+    <style name="SplashTheme" parent="Theme.AppCompat.NoActionBar">
+        <item name="android:windowBackground">@drawable/background_splash</item>
+    </style>
+
     <style name="UnderlinePageIndicator">
         <item name="selectedColor">@color/colorAccent</item>
     </style>