Update README.md

Author: srenon

README.md

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 ##### For Magento / Adobe Commerce 2.0.x, 2.1.x, 2.2.x, 2.3.x and 2.4.x
 
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+### OAuth SMTP Extension
+Are you tired of dealing with the hassle of managing email password? Don't wait any longer to upgrade to OAuth. Contact us at <a href="mailto:[email protected]">[email protected]</a> to learn more about our revolutionary OAuth SMTP Extension.
+
 Configure Magento 2 / Adobe Commerce to send all transactional emails using Google App, Gmail, Amazon Simple Email Service (SES), Microsoft Office365 or any other SMTP servers.
 
 <a href="https://bit.ly/mp-gh-smpt"><img src="https://user-images.githubusercontent.com/1415141/90457464-9a4ce380-e0c9-11ea-8aea-61d4f7cb679b.jpg" alt="Magento SMTP Extension" /></a>