chore: add a note in breaking changes about distribution

Author: radkostanev

upgrade/breaking-changes/9-0-0.md

@@ -0,0 +1,16 @@
+---
+title: 9.0.0
+description: Handle the changes in the 9.0.0 release of the Telerik UI for Blazor components.
+page_title: Breaking Changes in 9.0.0
+slug: changes-in-9-0-0
+position: 960
+---
+
+# Breaking Changes in 9.0.0
+
+### Trial and commercial users now use the same product package
+The trial and commercial product versions merged into a single unified distribution package. The product access now depends on a license key file. This eliminates the need for separate trial downloads. For more information, please refer to the [Telerik License Key](slug:installation-license-key).
+
+### .NET Support
+
+Telerik UI for Blazor 9.0.0 targets .NET 8 and no longer supports .NET 6 and .NET 7. For more information, see [System Requirements](slug:system-requirements).