[Microsoft.BillingBenefits] Initializing new service (Azure#32547)

* [Draft] Microsoft.Capacity testings

* Revert "[Draft] Microsoft.Capacity testings"

This reverts commit 99f6645.

* base

* Base

* SP order alias tests

* List SP items test

* Update with swagger changes

* SP Order Tests

* SP item tests

* Rename to reservationOrderAlias model

* Reservation order alias test

* reversed unneeded changes

* Update with swagger changes

* Update ci.mgmt.yml

* Comments

* update in swagger

* Update tests

* Update ReservationsManagementTestEnvironment.cs

* Update ReservationsManagementTestEnvironment.cs

* Update BillingBenefitsManagementTestEnvironment.cs

* Commentd

* Create Azure.ResourceManager.BillingBenefits.netstandard2.0.cs

* update

Author: gaoyp830

.vscode/cspell.json

@@ -175,6 +175,12 @@
         "cifs"
       ]
     },
+    {
+      "filename": "**/sdk/billingbenefits/**/*.cs",
+      "words": [
+        "Hana"
+      ]
+    },
     {
       "filename": "**/sdk/botservice/**/*.cs",
       "words": [

sdk/billingbenefits/Azure.ResourceManager.BillingBenefits/Azure.ResourceManager.BillingBenefits.sln

@@ -0,0 +1,51 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
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+EndProject
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+EndProject
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sdk/billingbenefits/Azure.ResourceManager.BillingBenefits/CHANGELOG.md

@@ -0,0 +1,17 @@
+# Release History
+
+## 1.0.0-beta.1 (Unreleased)
+
+### General New Features
+
+This package follows the [new Azure SDK guidelines](https://azure.github.io/azure-sdk/general_introduction.html), and provides many core capabilities:
+
+    - Support MSAL.NET, Azure.Identity is out of box for supporting MSAL.NET.
+    - Support [OpenTelemetry](https://opentelemetry.io/) for distributed tracing.
+    - HTTP pipeline with custom policies.
+    - Better error-handling.
+    - Support uniform telemetry across all languages.
+
+This package is a Public Preview version, so expect incompatible changes in subsequent releases as we improve the product. To provide feedback, submit an issue in our [Azure SDK for .NET GitHub repo](https://github.com/Azure/azure-sdk-for-net/issues).
+
+> NOTE: For more information about unified authentication, please refer to [Microsoft Azure Identity documentation for .NET](https://docs.microsoft.com//dotnet/api/overview/azure/identity-readme?view=azure-dotnet).

sdk/billingbenefits/Azure.ResourceManager.BillingBenefits/Directory.Build.props

@@ -0,0 +1,6 @@
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <!--
+    Add any shared properties you want for the projects under this package directory that need to be set before the auto imported Directory.Build.props
+  -->
+  <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory).., Directory.Build.props))\Directory.Build.props" />
+</Project>

sdk/billingbenefits/Azure.ResourceManager.BillingBenefits/README.md

@@ -0,0 +1,80 @@
+# Microsoft Azure BillingBenefits management client library for .NET
+
+Microsoft BillingBenefits is a Microsoft-managed service which allows management on Azure savings plan.
+
+This library follows the [new Azure SDK guidelines](https://azure.github.io/azure-sdk/general_introduction.html), and provides many core capabilities:
+
+    - Support MSAL.NET, Azure.Identity is out of box for supporting MSAL.NET.
+    - Support [OpenTelemetry](https://opentelemetry.io/) for distributed tracing.
+    - HTTP pipeline with custom policies.
+    - Better error-handling.
+    - Support uniform telemetry across all languages.
+
+## Getting started
+
+### Install the package
+
+Install the Microsoft Azure BillingBenefits management library for .NET with [NuGet](https://www.nuget.org/):
+
+```dotnetcli
+dotnet add package Azure.ResourceManager.BillingBenefits --prerelease
+```
+
+### Prerequisites
+
+* You must have an [Microsoft Azure subscription](https://azure.microsoft.com/free/dotnet/).
+
+### Authenticate the Client
+
+To create an authenticated client and start interacting with Microsoft Azure resources, see the [quickstart guide here](https://github.com/Azure/azure-sdk-for-net/blob/main/doc/dev/mgmt_quickstart.md).
+
+## Key concepts
+
+Key concepts of the Microsoft Azure SDK for .NET can be found [here](https://azure.github.io/azure-sdk/dotnet_introduction.html)
+
+## Documentation
+
+Documentation is available to help you learn how to use this package:
+
+- [Quickstart](https://github.com/Azure/azure-sdk-for-net/blob/main/doc/dev/mgmt_quickstart.md).
+- [API References](https://docs.microsoft.com/dotnet/api/?view=azure-dotnet).
+- [Authentication](https://github.com/Azure/azure-sdk-for-net/blob/main/sdk/identity/Azure.Identity/README.md).
+
+## Examples
+
+Code samples for using the management library for .NET can be found in the following locations
+- [.NET Management Library Code Samples](https://aka.ms/azuresdk-net-mgmt-samples)
+
+## Troubleshooting
+
+-   File an issue via [GitHub Issues](https://github.com/Azure/azure-sdk-for-net/issues).
+-   Check [previous questions](https://stackoverflow.com/questions/tagged/azure+.net) or ask new ones on Stack Overflow using Azure and .NET tags.
+
+## Next steps
+
+For more information about Microsoft Azure SDK, see [this website](https://azure.github.io/azure-sdk/).
+
+## Contributing
+
+For details on contributing to this repository, see the [contributing
+guide][cg].
+
+This project welcomes contributions and suggestions. Most contributions
+require you to agree to a Contributor License Agreement (CLA) declaring
+that you have the right to, and actually do, grant us the rights to use
+your contribution. For details, visit <https://cla.microsoft.com>.
+
+When you submit a pull request, a CLA-bot will automatically determine
+whether you need to provide a CLA and decorate the PR appropriately
+(for example, label, comment). Follow the instructions provided by the
+bot. You'll only need to do this action once across all repositories
+using our CLA.
+
+This project has adopted the [Microsoft Open Source Code of Conduct][coc]. For
+more information, see the [Code of Conduct FAQ][coc_faq] or contact
+<opencode@microsoft.com> with any other questions or comments.
+
+<!-- LINKS -->
+[cg]: https://github.com/Azure/azure-sdk-for-net/blob/main/sdk/resourcemanager/Azure.ResourceManager/docs/CONTRIBUTING.md
+[coc]: https://opensource.microsoft.com/codeofconduct/
+[coc_faq]: https://opensource.microsoft.com/codeofconduct/faq/