Update README.md

Author: coryleach

README.md

@@ -25,6 +25,21 @@ Find the manifest.json file in the Packages folder of your project and edit it t
 }
 ```
 
+## Quick Start
+
+### Add a Singleton Service and Get it
+```c#
+//In your game bootstrapper script
+var myService = new MyService(); //MyService implements custom interface IMyService
+ServiceCollection.Current.AddService(myService);
+
+...
+
+//In some other script someplace
+var myService = ServiceProvider.Current.GetService<IMyService>();
+myService.DoStuff();
+```
+
 ## Author
 
 👤 **Cory Leach**