Provide Microsoft.Extensions.Logging.AzureAppServices package README (#57824)

Author: MackinnonBuck

src/Logging.AzureAppServices/src/PACKAGE.md

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+## About
+
+`Microsoft.Extensions.Logging.AzureAppServices` provides a logger implementation that logs to text files in an Azure App Service app's file system and to blob storage in an Azure Storage account.
+
+## Key Features
+
+* Loging messages with the "Diagnostics Logger" and "Log Streaming" features of Azure App Service
+* Integration with Azure App Service logging infrastructure
+* Seamless integration with other components of `Microsoft.Extensions.Logging`
+
+## How to Use
+
+To use `Microsoft.Extensions.Logging.AzureAppServices`, follow these steps:
+
+### Installation
+
+```shell
+dotnet add package Microsoft.Extensions.Logging.AzureAppServices
+```
+
+### Configuration
+
+To configure provider settings, use `AzureFileLoggerOptions` and `AzureBlobLoggerOptions`, as shown in the following example:
+
+```csharp
+using Microsoft.Extensions.Logging.AzureAppServices;
+
+var builder = WebApplication.CreateBuilder();
+builder.Logging.AddAzureWebAppDiagnostics();
+builder.Services.Configure<AzureFileLoggerOptions>(options =>
+{
+    options.FileName = "azure-diagnostics-";
+    options.FileSizeLimit = 50 * 1024;
+    options.RetainedFileCountLimit = 5;
+});
+builder.Services.Configure<AzureBlobLoggerOptions>(options =>
+{
+    options.BlobName = "log.txt";
+});
+```
+
+## Main Types
+
+* `FileLoggerProvider`: A `BatchingLoggerProvider` which writes out to a file
+* `BlobLoggerProvider`: The `ILoggerProvider` implementation that stores messages by appending them to Azure Blob in batches
+* `AzureFileLoggerOptions`: Options for configuring Azure diagnostics file logging
+* `AzureBlobLoggerOptions`: Options for configuring Azure diagnostics blob logging
+
+## Additional Documentation
+
+For additional documentation and examples, refer to the [official documentation](https://learn.microsoft.com/aspnet/core/fundamentals/logging#azure-app-service) on logging with ASP.NEt Core and Azure App Service.
+
+## Feedback &amp; Contributing
+
+`Microsoft.Extensions.Logging.AzureAppServices` is released as open-source under the [MIT license](https://licenses.nuget.org/MIT). Bug reports and contributions are welcome at [the GitHub repository](https://github.com/dotnet/aspnetcore).