Link to InMemoryFileProvider (aspnet#246)

* Link to InMemoryFileProvider

As per @pranavkm's comment on aspnet#221 - adding a link to my contrib project.
Made it a table in case there are other community contributions.

* corrected readme as per pr review

* corrected readme

README.md

@@ -1,9 +1,17 @@
 FileProvider
 ==========
-AppVeyor: [![AppVeyor](https://ci.appveyor.com/api/projects/status/8pryt261xf7q0cb6/branch/dev?svg=true)](https://ci.appveyor.com/project/aspnetci/FileSystem/branch/dev)
 
-Travis:   [![Travis](https://travis-ci.org/aspnet/FileSystem.svg?branch=dev)](https://travis-ci.org/aspnet/FileSystem)
+| Build System  | Status |
+| :-----------: | :-----  |
+| AppVeyor  | [![AppVeyor](https://ci.appveyor.com/api/projects/status/8pryt261xf7q0cb6/branch/dev?svg=true)](https://ci.appveyor.com/project/aspnetci/FileSystem/branch/dev)  |
+| Travis  | [![Travis](https://travis-ci.org/aspnet/FileSystem.svg?branch=dev)](https://travis-ci.org/aspnet/FileSystem)  |
 
 File Provider abstractions. Contains file system abstractions and file system globbing.
 
 This project is part of ASP.NET Core. You can find samples, documentation and getting started instructions for ASP.NET Core at the [Home](https://github.com/aspnet/home) repo.
+
+In addition, there are some community FileProvider implementations that you may find useful:
+
+| Project | Description | Latest Stable NuGet |
+| :-----------: | :-----  | :----- |
+| [Dazinator.AspNet.Extensions.FileProviders](https://github.com/dazinator/Dazinator.AspNet.Extensions.FileProviders) | Provides an InMemoryFileProvider and a RequestPathFileProvider, open to additional contributions. | [![NuGet](https://img.shields.io/nuget/v/Dazinator.AspNet.Extensions.FileProviders.svg)](https://www.nuget.org/packages/Dazinator.AspNet.Extensions.FileProviders/) |