add timeonly

Author: mongoKart

source/whats-new.txt

@@ -65,6 +65,12 @@ The 3.0 driver release includes the following new features:
   `DateOnly Struct. <https://learn.microsoft.com/en-us/dotnet/api/system.dateonly?view=net-6.0>`__
   API reference page on MSDN.
 
+- Adds support for the ``TimeOnly`` type, which represents a time value with no
+  date component. This type is available in .NET 6 and later. To learn more about the
+  ``TimeOnly`` type, see the
+  `DateOnly Struct. <https://learn.microsoft.com/en-us/dotnet/api/system.timeonly?view=net-6.0>`__
+  API reference page on MSDN.
+
 .. _csharp-version-2.28:
 
 What's New in 2.28