Fix inclusions and readme contents

Author: kzu

readme.md

@@ -8,6 +8,7 @@ High-performance [System.Threading.Channels](https://devblogs.microsoft.com/dotn
 [![License](https://img.shields.io/github/license/devlooped/WebSocketChannel.svg?color=blue)](https://github.com/devlooped/WebSocketChannel/blob/main/license.txt)
 [![Build](https://github.com/devlooped/WebSocketChannel/workflows/build/badge.svg?branch=main)](https://github.com/devlooped/WebSocketChannel/actions)
 
+<!-- #content -->
 # Usage
 
 ```csharp
@@ -76,6 +77,7 @@ app.Use(async (context, next) =>
 });
 ```
 
+<!-- #content -->
 # Installation
 
 This project can be used either as a regular nuget package:

src/WebSocketChannel/readme.md

@@ -1,108 +1,5 @@
-[![Version](https://img.shields.io/nuget/v/WebSocketChannel.svg?color=royalblue)](https://www.nuget.org/packages/WebSocketChannel)
-[![Downloads](https://img.shields.io/nuget/dt/WebSocketChannel.svg?color=green)](https://www.nuget.org/packages/WebSocketChannel)
-[![License](https://img.shields.io/github/license/devlooped/WebSocketChannel.svg?color=blue)](https://github.com/devlooped/WebSocketChannel/blob/main/license.txt)
-[![Build](https://github.com/devlooped/WebSocketChannel/workflows/build/badge.svg?branch=main)](https://github.com/devlooped/WebSocketChannel/actions)
+<!-- include ../../readme.md#content -->
+<!-- include ../../readme.md#sponsors -->
 
-# Usage
-
-```csharp
-var client = new ClientWebSocket();
-await client.ConnectAsync(serverUri, CancellationToken.None);
-
-Channel<ReadOnlyMemory<byte>> channel = client.CreateChannel();
-
-await channel.Writer.WriteAsync(Encoding.UTF8.GetBytes("hello").AsMemory());
-
-// Read single message when it arrives
-ReadOnlyMemory<byte> response = await channel.Reader.ReadAsync();
-
-// Read all messages while underlying websocket is open
-await foreach (var item in channel.Reader.ReadAllAsync())
-{
-    Console.WriteLine(Encoding.UTF8.GetString(item.Span));
-}
-
-// Completing the writer closes the underlying websocket cleanly
-channel.Writer.Complete();
-
-// Can also complete reporting an error for the remote party
-channel.Writer.Complete(new InvalidOperationException("Bad format"));
-```
-
-
-The `WebSocketChannel` can also be used on the server. The following example is basically 
-taken from the documentation on [WebSockets in ASP.NET Core](https://docs.microsoft.com/en-us/aspnet/core/fundamentals/websockets?view=aspnetcore-5.0#configure-the-middleware) 
-and adapted to use a `WebSocketChannel` to echo messages to the client:
-
-```csharp
-app.Use(async (context, next) =>
-{
-    if (context.Request.Path == "/ws")
-    {
-        if (context.WebSockets.IsWebSocketRequest)
-        {
-            using var webSocket = await context.WebSockets.AcceptWebSocketAsync();
-            var channel = WebSocketChannel.Create(webSocket);
-            try
-            {
-                await foreach (var item in channel.Reader.ReadAllAsync(context.RequestAborted))
-                {
-                    await channel.Writer.WriteAsync(item, context.RequestAborted);
-                }
-            }
-            catch (OperationCanceledException)
-            {
-                try
-                {
-                    await webSocket.CloseOutputAsync(WebSocketCloseStatus.NormalClosure, null, default);
-                }
-                catch { } // Best effort to try closing cleanly. Client may be entirely gone.
-            }
-        }
-        else
-        {
-            context.Response.StatusCode = (int) HttpStatusCode.BadRequest;
-        }
-    }
-    else
-    {
-        await next();
-    }
-});
-```
-
-
-# Installation
-
-This project can be used either as a regular nuget package:
-
-```
-<PackageReference Include="WebSocketChannel" Version="*" />
-```
-
-Or alternatively, referenced directly as a source-only dependency using [dotnet-file](https://www.nuget.org/packages/dotnet-file):
-
-```
-> dotnet file add https://github.com/devlooped/WebSocketChannel/blob/main/src/WebSocketChannel/WebSocketChannel.cs
-> dotnet file add https://github.com/devlooped/WebSocketChannel/blob/main/src/WebSocketChannel/WebSocketExtensions.cs
-```
-
-It's also possible to specify a desired target location for the referenced source files, such as:
-
-```
-> dotnet file add https://github.com/devlooped/WebSocketChannel/blob/main/src/WebSocketChannel/WebSocketChannel.cs src/MyProject/External/.
-> dotnet file add https://github.com/devlooped/WebSocketChannel/blob/main/src/WebSocketChannel/WebSocketExtensions.cs src/MyProject/External/.
-```
-
-When referenced as loose source files, it's easy to also get automated PRs when the upstream files change, 
-as in the [dotnet-file.yml](https://github.com/devlooped/dotnet-file/blob/main/.github/workflows/dotnet-file.yml) workflow that 
-keeps the repository up to date with a template. See also [dotnet-config](https://dotnetconfig.org), which is used to 
-for the `dotnet-file` configuration settings that tracks all this.
-
-
-
-## Sponsors
-
-[![sponsored](https://raw.githubusercontent.com/devlooped/oss/main/assets/images/sponsors.svg)](https://github.com/sponsors/devlooped) [![clarius](https://raw.githubusercontent.com/clarius/branding/main/logo/byclarius.svg)](https://github.com/clarius)[![clarius](https://raw.githubusercontent.com/clarius/branding/main/logo/logo.svg)](https://github.com/clarius)
-
-*[get mentioned here too](https://github.com/sponsors/devlooped)!*
+<!-- Exclude from auto-expansion by devlooped/actions-include GH action -->
+<!-- exclude -->