Update README.md

README.md

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 # simple-splash-screen
 An example project to show how to implement a simple splash screen
+
+You start by creating a new activity called SplashActivity and define it as the Launcher Activity, then you set the SplashTheme in the activity definition in AndroidManifest.xml
+
+```
+<activity
+    android:name=".SplashActivity"
+    android:theme="@style/SplashTheme">
+    <intent-filter>
+        <action android:name="android.intent.action.MAIN" />
+        <category android:name="android.intent.category.LAUNCHER" />
+    </intent-filter>
+</activity>
+```
+
+In res -> values -> styles.xml you create a new style with SplashTheme name and define an item called android:windowBackground that will be a drawable that you will create in the next step.
+
+```
+<style name="SplashTheme" parent="Theme.AppCompat.NoActionBar">
+    <item name="android:windowBackground">@drawable/background_splash</item>
+</style>
+```
+
+In res -> drawable folder you will create a background_splash.xml with two layers, a white background and the launcher icon the in center. You can customize this xml file the way you want.
+
+```
+<?xml version="1.0" encoding="utf-8"?>
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item
+        android:drawable="@color/white"/>
+    <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@drawable/ic_launcher"/>
+    </item>
+</layer-list>
+```