Initial project layout and interfaces.

AsyncRx.NET/AsyncRx.NET.sln

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+EndProject
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+EndProject
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+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Playground", "Playground\Playground.csproj", "{3B83795B-9870-43FA-82AF-95A44CF0194F}"
+EndProject
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AsyncRx.NET/Playground/Playground.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp2.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\System.Reactive.Async\System.Reactive.Async.csproj" />
+  </ItemGroup>
+
+</Project>

AsyncRx.NET/Playground/Program.cs

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+using System;
+
+namespace Playground
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("Hello World!");
+        }
+    }
+}

AsyncRx.NET/System.Reactive.Async/System.Reactive.Async.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Folder Include="System\Reactive\Linq\" />
+  </ItemGroup>
+
+</Project>

AsyncRx.NET/System.Reactive.Async/System/IAsyncDisposable.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information. 
+
+using System.Threading.Tasks;
+
+namespace System
+{
+    public interface IAsyncDisposable
+    {
+        Task DisposeAsync();
+    }
+}

AsyncRx.NET/System.Reactive.Async/System/IAsyncObservable.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information. 
+
+using System.Threading.Tasks;
+
+namespace System
+{
+    public interface IAsyncObservable<out T>
+    {
+        Task<IAsyncDisposable> SubscribeAsync(IAsyncObserver<T> observer);
+    }
+}

AsyncRx.NET/System.Reactive.Async/System/IAsyncObserver.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the Apache 2.0 License.
+// See the LICENSE file in the project root for more information. 
+
+using System.Threading.Tasks;
+
+namespace System
+{
+    public interface IAsyncObserver<in T>
+    {
+        Task OnNextAsync(T value);
+        Task OnErrorAsync(Exception error);
+        Task OnCompletedAsync();
+    }
+}