stub out xamarin project

src/App/App.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+    <RootNamespace>Bit.App</RootNamespace>
+    <AssemblyName>BitwardenApp</AssemblyName>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
+    <DebugType>pdbonly</DebugType>
+    <DebugSymbols>true</DebugSymbols>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Xamarin.Forms" Version="3.6.0.264807" />
+  </ItemGroup>
+</Project>

src/App/App.xaml

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+<?xml version="1.0" encoding="utf-8" ?>
+<Application xmlns="http://xamarin.com/schemas/2014/forms"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="Bit.App.App">
+    <Application.Resources>
+
+    </Application.Resources>
+</Application>

src/App/App.xaml.cs

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+using System;
+using Xamarin.Forms;
+using Xamarin.Forms.Xaml;
+
+[assembly: XamlCompilation(XamlCompilationOptions.Compile)]
+namespace Bit.App
+{
+    public partial class App : Application
+    {
+        public App()
+        {
+            InitializeComponent();
+
+            MainPage = new MainPage();
+        }
+
+        protected override void OnStart()
+        {
+            // Handle when your app starts
+        }
+
+        protected override void OnSleep()
+        {
+            // Handle when your app sleeps
+        }
+
+        protected override void OnResume()
+        {
+            // Handle when your app resumes
+        }
+    }
+}

src/App/MainPage.xaml

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+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             xmlns:local="clr-namespace:App"
+             x:Class="Bit.App.MainPage">
+
+    <StackLayout>
+        <!-- Place new controls here -->
+        <Label Text="Welcome to Xamarin.Forms!" 
+           HorizontalOptions="Center"
+           VerticalOptions="CenterAndExpand" />
+    </StackLayout>
+
+</ContentPage>

src/App/MainPage.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Xamarin.Forms;
+
+namespace Bit.App
+{
+    public partial class MainPage : ContentPage
+    {
+        public MainPage()
+        {
+            InitializeComponent();
+        }
+    }
+}