stub out xamarin project

src/Android/MainActivity.cs

@@ -0,0 +1,31 @@
+using System;
+
+using Android.App;
+using Android.Content.PM;
+using Android.Runtime;
+using Android.Views;
+using Android.Widget;
+using Android.OS;
+
+namespace Bit.Droid
+{
+    [Activity(
+        Label = "Bitwarden",
+        MainLauncher = true,
+        Icon = "@mipmap/ic_launcher",
+        Theme = "@style/MainTheme",
+        ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation)]
+    [Register("com.x8bit.bitwarden.MainActivity")]
+    public class MainActivity : global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
+    {
+        protected override void OnCreate(Bundle savedInstanceState)
+        {
+            TabLayoutResource = Resource.Layout.Tabbar;
+            ToolbarResource = Resource.Layout.Toolbar;
+
+            base.OnCreate(savedInstanceState);
+            global::Xamarin.Forms.Forms.Init(this, savedInstanceState);
+            LoadApplication(new App.App());
+        }
+    }
+}