Add keyed service sample

Author: dodyg

README.md

@@ -1,6 +1,6 @@
-# Samples for ASP.NET Core 6.0, 7.0 and 8.0 RC 1 (494)
+# Samples for ASP.NET Core 6.0, 7.0 and 8.0 RC 1 (495)
 
-- Samples for ASP.NET Core **8.0 RC 1** is available [here](/projects/.net8) (32).
+- Samples for ASP.NET Core **8.0 RC 1** is available [here](/projects/.net8) (33).
 - Samples for ASP.NET Core **7.0** is available [here](/projects/.net7) (45).
 - Samples for ASP.NET Core **8.0 Preview 6** using EdgeDB.NET is [here](https://github.com/edgedb/edgedb-net).
 

projects/.net8/README.md

@@ -1,4 +1,4 @@
-# ASP.NET 8.0 Preview 7 (32)
+# ASP.NET 8.0 Preview 7 (33)
 
 These samples require [.NET 8.0 RC 1](https://github.com/dotnet/installer#table). 
 
@@ -136,4 +136,10 @@ These samples require [.NET 8.0 RC 1](https://github.com/dotnet/installer#table)
 
   * [Minimal API Form Model Binding](minimal-api-form-model-binding)
 
-    This sample demonstrates the ability to use `[FromForm]` binding in Minimal API.
+    This sample demonstrates the ability to use `[FromForm]` binding in Minimal API.
+
+## Keyed Services
+
+  * [Keyed Services in Minimal API]
+
+    Use `IServiceProvider.GetRequiredKeyedService<T>(key)` to get different type of implementation instances based on string key in Minimal API