App Config emulator 1.0.0-preview (#1085)

* release note 1.0.0-preview

* Update releaseNotes/AppConfigurationEmulator.md

Co-authored-by: Jimmy Campbell <jimmyca@microsoft.com>

---------

Co-authored-by: Jimmy Campbell <jimmyca@microsoft.com>

Author: zhiyuanliang-ms

releaseNotes/AppConfigurationEmulator.md

@@ -0,0 +1,27 @@
+# Azure App Configuration Emulator
+
+[Image][image] | [Source code][source_code] | [Samples][samples]
+
+## 1.0.0-preview - July 31, 2025
+
+Initial preview release of the Azure App Configuration emulator.
+
+The Azure App Configuration Emulator is a local development tool that provides a lightweight implementation of the Azure App Configuration service. This emulator allows developers to test and develop applications locally without requiring an active Azure subscription or connection to the cloud service.
+
+### Supported Features
+
+* Authentication Methods
+  * Anonymous authentication
+  * HMAC authentication
+* Resources
+  * `/keys`
+  * `/kv`
+  * `/labels`
+  * `/locks`
+  * `/revisions`
+* Web UI
+
+<!-- LINKS -->
+[image]: https://mcr.microsoft.com/artifact/mar/azure-app-configuration/app-configuration-emulator/about
+[source_code]: https://github.com/Azure/AppConfiguration-Emulator
+[samples]: https://github.com/Azure/AppConfiguration-Emulator/tree/main/examples