Add release notes

Author: sdwheeler

articles/cloud-shell/TOC.yml

@@ -5,6 +5,8 @@ items:
         href: overview.md
       - name: Features & tools
         href: features.md
+      - name: Release notes
+        href: release-notes.md
   - name: Get started with Cloud Shell
     items:
       - name: Get started (Classic)

articles/cloud-shell/release-notes.md

@@ -0,0 +1,45 @@
+---
+title: Azure Cloud Shell release notes
+description: This article lists the new features and changes released in Azure Cloud Shell.
+ms.date: 06/25/2024
+---
+
+# Azure Cloud Shell release notes
+
+The following document outlines the changes to Azure Cloud Shell. The Cloud Shell container image is
+updated on a monthly basis to reflect the latest changes. Changes can include new or updated
+features and tools, security updates, and bug fixes.
+
+## May 2024
+
+### New features
+
+- Updated user interface
+
+  Cloud Shell recently updated the user interface for the Cloud Shell terminal window. The new
+  toolbar uses text-based menu items rather than icons, making it easier to find the desired action.
+
+  For more information, see
+  [How to use the new user interface for Azure Cloud Shell](new-ui-shell-window.md).
+
+- Support for ephemeral sessions
+
+  Ephemeral sessions don't require a storage account. When your Cloud Shell session ends, which
+  occurs shortly after the window is closed or when Cloud Shell is restarted, all files you saved
+  are deleted and don't persist across sessions.
+
+  For more information, see
+  [Get started with Azure Cloud Shell ephemeral sessions](./get-started/ephemeral.md?tabs=powershell).
+
+### Deprecated Packages
+
+The following packages have been removed for security compliance reasons. These packages have been
+deprecated by the package owners or are no longer maintained. If you need to use these tools, you
+can install them in your Cloud Shell session. For installation instructions, consult the
+documentation for the package you require.
+
+- [Batch-Shipyard](https://github.com/Azure/batch-shipyard)
+- [blobxfer](https://github.com/Azure/blobxfer)
+- [Yeoman (yo)](https://yeoman.io/)
+- [generator-az-terra module](https://github.com/Azure/generator-az-terra-module)
+- [Azure-functions-cli](https://github.com/Azure/azure-functions-core-tools)