add release notes (#1032)

Author: samsadsam

releaseNotes/MicrosoftAzureAppConfigurationAspNetCore.md

@@ -1,6 +1,9 @@
 # Microsoft.Azure.AppConfiguration.AspNetCore
 [Source code][source_code] | [Package (NuGet)][package]
 
+## 8.2.0-preview - March 21st, 2025
+* Updated `Microsoft.Extensions.Configuration.AzureAppConfiguration` reference to `8.2.0-preview`. See the [release notes](./MicrosoftExtensionsConfigurationAzureAppConfiguration.md) for more information on the changes.
+
 ## 8.1.1 - February 26th, 2025
 * Updated `Microsoft.Extensions.Configuration.AzureAppConfiguration` reference to `8.1.1`. See the [release notes](./MicrosoftExtensionsConfigurationAzureAppConfiguration.md) for more information on the changes.
 

releaseNotes/MicrosoftAzureAppConfigurationFunctionsWorker.md

@@ -1,6 +1,9 @@
 # Microsoft.Azure.AppConfiguration.Functions.Worker
 [Source code][source_code] | [Package (NuGet)][package]
 
+## 8.2.0-preview - March 21st, 2025
+* Updated `Microsoft.Extensions.Configuration.AzureAppConfiguration` reference to `8.2.0-preview`. See the [release notes](./MicrosoftExtensionsConfigurationAzureAppConfiguration.md) for more information on the changes.
+
 ## 8.1.1 - February 26th, 2025
 * Updated `Microsoft.Extensions.Configuration.AzureAppConfiguration` reference to `8.1.1`. See the [release notes](./MicrosoftExtensionsConfigurationAzureAppConfiguration.md) for more information on the changes.
 

releaseNotes/MicrosoftExtensionsConfigurationAzureAppConfiguration.md

@@ -1,6 +1,14 @@
 # Microsoft.Extensions.Configuration.AzureAppConfiguration
 [Source code][source_code] | [Package (NuGet)][package]
 
+## 8.2.0-preview - March 21st, 2025
+### Enhancements
+* Added the ability to set a client factory used for creating ConfigurationClient instances. [#380](https://github.com/Azure/AppConfiguration-DotnetProvider/issues/380)
+
+   ```cs
+   public AzureAppConfigurationOptions SetClientFactory(IAzureClientFactory<ConfigurationClient> factory)
+   ```
+
 ## 8.1.1 - February 26th, 2025
 ### Bug Fixes
 * Fixed a bug introduced in the 8.1.0 release where calls to `FeatureFlagOptions.Select` were ignored if they were followed by a call to either `AzureAppConfigurationOptions.Select` or `AzureAppConfigurationOptions.SelectSnapshot`. [#628](https://github.com/Azure/AppConfiguration-DotnetProvider/issues/628)