Add basic usage to README.md [Skip CI]

Author: nblumhardt

README.md

@@ -1,9 +1,22 @@
-# Serilog.Enrichers.Thread
+# Serilog.Enrichers.Thread [![Build status](https://ci.appveyor.com/api/projects/status/2vgxdy3swg6eaj3f?svg=true)](https://ci.appveyor.com/project/serilog/serilog-enrichers-thread) [![NuGet Version](http://img.shields.io/nuget/v/Serilog.Enrichers.Thread.svg?style=flat)](https://www.nuget.org/packages/Serilog.Enrichers.Thread/)
 
 Enrich Serilog events with properties from the current thread.
 
-[![Build status](https://ci.appveyor.com/api/projects/status/2vgxdy3swg6eaj3f?svg=true)](https://ci.appveyor.com/project/serilog/serilog-enrichers-thread) [![NuGet Version](http://img.shields.io/nuget/v/Serilog.Enrichers.Thread.svg?style=flat)](https://www.nuget.org/packages/Serilog.Enrichers.Thread/)
+### Getting started
+
+Install the package from NuGet:
+
+```powershell
+Install-Package Serilog.Enrichers.Thread
+```
+
+In your logger configuration, apply `Enrich.WithThreadId()`:
+
+```csharp
+Log.Logger = new LoggerConfiguration()
+    .Enrich.WithThreadId()
+    .CreateLogger();
+```
 
-* [Documentation](https://github.com/serilog/serilog/wiki)
 
 Copyright © 2016 Serilog Contributors - Provided under the [Apache License, Version 2.0](http://apache.org/licenses/LICENSE-2.0.html).