added placeholders for basic auth

Author: NickRimmer

src/Extensions/RestApia.Extensions.Auth.Basic/BasicAuthService.cs

@@ -18,8 +18,8 @@ public class BasicAuthService: IAuthValuesProvider
         CanBeCached = false,
         ReservedValues =
         [
-            new () { Name = nameof(BasicAuthSettings.Name), Description = "User name" },
-            new () { Name = nameof(BasicAuthSettings.Password), Description = "User Password" },
+            new () { Name = nameof(BasicAuthSettings.Name), Description = "User name", IsRequired = true, Placeholder = "User" },
+            new () { Name = nameof(BasicAuthSettings.Password), Description = "User Password", Placeholder = "secret" },
         ],
     };