Splash screen, styling updates, focus with delay for android.

src/Android/SplashActivity.cs

@@ -0,0 +1,32 @@
+using System;
+using Android.App;
+using Android.OS;
+using Android.Content;
+using Android.Support.V7.App;
+using System.Threading.Tasks;
+
+namespace Bit.Android
+{
+    [Activity(Theme = "@style/BitwardenTheme.Splash", 
+        MainLauncher = true, 
+        NoHistory = true,
+        WindowSoftInputMode = global::Android.Views.SoftInput.StateHidden)]
+    public class SplashActivity : AppCompatActivity
+    {
+        public override void OnCreate(Bundle savedInstanceState, PersistableBundle persistentState)
+        {
+            base.OnCreate(savedInstanceState, persistentState);
+        }
+
+        protected override void OnResume()
+        {
+            base.OnResume();
+            var startupWork = new Task(() =>
+            {
+                StartActivity(new Intent(Application.Context, typeof(MainActivity)));
+            });
+
+            startupWork.Start();
+        }
+    }
+}