Add README.md

Author: kevinchalet

README.md

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+AspNet.Security.OAuth.Extensions
+================================
+
+**AspNet.Security.OAuth.Extensions** is a collection of **token validation middleware** for ASP.NET Core 1.0 and OWIN/Katana.
+
+**The latest nightly builds can be found on [MyGet](https://www.myget.org/gallery/aspnet-contrib)**.
+
+[![Build status](https://ci.appveyor.com/api/projects/status/aa7t5nfxpiri1e85/branch/dev?svg=true)](https://ci.appveyor.com/project/aspnet-contrib/aspnet-security-oauth-extensions/branch/dev)
+[![Build status](https://travis-ci.org/aspnet-contrib/AspNet.Security.OAuth.Extensions.svg?branch=dev)](https://travis-ci.org/aspnet-contrib/AspNet.Security.OAuth.Extensions)
+
+## Get started
+
+```csharp
+app.UseOAuthValidation(options => {
+    options.Audiences.Add("resource_server");
+});
+```
+
+```csharp
+app.UseOAuthIntrospection(options => {
+    options.AutomaticAuthenticate = true;
+    options.AutomaticChallenge = true;
+    options.Audiences.Add("resource_server");
+    options.Authority = "http://localhost:54540/";
+    options.ClientId = "resource_server";
+    options.ClientSecret = "875sqd4s5d748z78z7ds1ff8zz8814ff88ed8ea4z4zzd";
+});
+```
+
+## Support
+
+**Need help or wanna share your thoughts?** Don't hesitate to join our dedicated chat rooms:
+
+- **JabbR: [https://jabbr.net/#/rooms/aspnet-contrib](https://jabbr.net/#/rooms/aspnet-contrib)**
+- **Gitter: [https://gitter.im/aspnet-contrib/AspNet.Security.OAuth.Extensions](https://gitter.im/aspnet-contrib/AspNet.Security.OAuth.Extensions)**
+
+## Contributors
+
+**AspNet.Security.OAuth.Extensions** is actively maintained by **[Kévin Chalet](https://github.com/PinpointTownes)**. Contributions are welcome and can be submitted using pull requests.
+
+## License
+
+This project is licensed under the **Apache License**. This means that you can use, modify and distribute it freely. See [http://www.apache.org/licenses/LICENSE-2.0.html](http://www.apache.org/licenses/LICENSE-2.0.html) for more details.