Add support document

Author: azure-sdk

SUPPORT.md

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+# Support
+
+## Important Annoucement
+
+As of February 2021, the Azure SDK for PHP has entered a retirement phase and is no longer officially supported by Microsoft. This repository will no longer be maintained.  
+
+>NOTE: Please note that the Azure Storage SDK for PHP will be separately maintained in [its own repo](https://github.com/Azure/azure-storage-php)
+If you prefer to work in PHP, you can also directly [call the Azure REST API in PHP](https://docs.microsoft.com/en-us/rest/api/azure/) 
+
+Thank you for your support so far. Should you have any question, please feel free to open an Issue on GitHub.
+
+## How to file issues and get help  
+
+Since the repository has entered a retirement phase, please note that we can no longer support bug fixes / feature requests. However, if you do have a general inquiry, please file 
+your question as a new Issue. Before you file a new issue, please search in existing issues to avoid duplicate. 
+
+## Microsoft Support Policy  
+
+Support for this repository is limited to the resources listed above.