Update README.md

Author: sohail-aspose

README.md

@@ -18,6 +18,7 @@ All Aspose.Email for Cloud SDKs, helper scripts and templates are licensed under
 + [**Website**](https://www.aspose.cloud)
 + [**Product Home**](https://products.aspose.cloud/Email/cloud)
 + [**Documentation**](https://docs.aspose.cloud/display/Emailcloud/Home)
++ [**API Reference**](https://apireference.aspose.cloud/email/)
 + [**Free Support Forum**](https://forum.aspose.cloud/c/email)
 + [**Paid Support Helpdesk**](https://helpdesk.aspose.cloud/)
 + [**Blog**](https://blog.aspose.cloud/category/aspose-products/aspose-email-cloud/)