Added release notes and version entries for 2025.13.0

Author: GitHub Actions

website/blog/2025-03-28-Release-0.md

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+---
+author: meshcloud
+title: Release 2025.13.0
+---
+
+Release period: 2025-03-26 to 2025-03-28
+
+This release includes the following issues:
+* README Support in the Marketplace
+* Fix Enabling Due Date for Notifications
+<!--truncate-->
+
+## Ticket Details
+### README Support in the Marketplace
+**Audience:** Customer<br>
+
+#### Description
+Platform teams can now provide a markdown README for building block definitions. This README is useful for providing usage instructions and other relevant information to users. Platform services built using Open Service Broker API can leverage the new README section in the marketplace via the 'longDescription' field of the OSB Catalog.
+
+### Fix Enabling Due Date for Notifications
+**Audience:** Partner<br>
+
+#### Description
+There was an issue where a due date could be retained when switching the communication type from "Action Required" 
+to "Notification" in the Communication Creation Wizard.
+This fix ensures that when the type is changed to "Notification", the due date field 
+is hidden and any previously set due date is cleared.
+