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+An ultra-lightweight Rx source-only (C#) nuget to avoid depending on the full 
+[System.Reactive](https://www.nuget.org/packages/System.Reactive) for `IObservable<T>` 
+producers.
 
-<!-- include ../../docs/footer.md -->
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+100% dependency-free (source-based) support for library authors exposing IObservable&lt;T&gt; leveraging 
+Subject&lt;T&gt;, CompositeDisposable, IObservable&lt;T&gt;.Subscribe extension method overloads,
+IObservable&lt;T&gt;.Select/Where/OfType LINQ operators, and others.
+
+# Usage
+
+All of the documentation and samples for `Subject<T>` and the provided extension methods 
+(i.e. `Subscribe` overloads) that are officially available for `System.Reactive` apply to 
+this project as well, since the implementations are heavily based on it (taking them to 
+the bare essentials for source-only inclusion, with `Subject<T>` being pretty much exactly 
+the same). 
+For example: [Using Subjects](https://docs.microsoft.com/en-us/previous-versions/dotnet/reactive-extensions/hh242970(v=vs.103)).
+
+```csharp
+using System;
+using System.Reactive.Subjects;
+
+var subject = new Subject<string>();
+
+subject.Subscribe(x => Console.WriteLine($"Got raw value {x}"));
+
+subject.Where(x => int.TryParse(x, out _))
+    .Select(x => int.Parse(x))
+    .Subscribe(x => Console.WriteLine($"Got number {x} (squared is {x * x})"));
+
+subject.Where(x => bool.TryParse(x, out var value) && value)
+    .Subscribe(x => Console.WriteLine($"Got a boolean True"));
+
+while (Console.ReadLine() is var line && !string.IsNullOrEmpty(line))
+    subject.OnNext(line);
+```
+
+This package is a drop-in replacement for `System.Reactive` if you are only using the 
+most common subset of features in it that are also provided in this project.
+
+# Why
+
+For the most part, a producer needs the `Subject<T>` (read more about 
+[using subjects](https://docs.microsoft.com/en-us/previous-versions/dotnet/reactive-extensions/hh242970(v=vs.103))) 
+and maybe the `ObservableExtensions` that provide `Subscribe` overloads to provide 
+lambdas instead of an `IObserver<T>`. Taking the somewhat large and heavy dependency 
+on the full [System.Reactive](https://www.nuget.org/packages/System.Reactive) to consume 
+just the basics a reusable library needs is overkill in most cases.
+
+In addition to `Subject<T>`, typical activities of a producer are to handle disposables 
+and potentially filter/query/convert other observables they consume themselves. 
+So the following simple features are provided: 
+
+- `Disposable.Empty` and `Disposable.Create(Action)`
+- `CompositeDisposable`: allows disposing subscriptions as a group
+ - `Subject<T>`: for producing observable sequences
+ - Extension methods for `IObservable<T>`:
+   * `Subscribe` overloads receiving delegates for onNext, onError and onCompleted
+   * `Select`/`Where`/`OfType` LINQ operators
+
+This is what this project provides at the moment, in source form, in your project, as internal 
+classes for your own implementation usage, with no external dependencies. They are not even 
+visible in the project since NuGet provides them automatically to the compiler, embedded into 
+your own assembly, and which you can fully debug as any other code in your project.
+
+<!-- #content -->
+<!-- ../../readme.md#content -->
+
+<!-- include ../../docs/footer.md -->
+# Sponsors 
+
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+
+
+<!-- sponsors.md -->
+
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