Add note about deprecating this repository

Author: tsipinakis

README.md

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 <!--suppress HtmlDeprecatedAttribute -->
 <h1 align="center">libcontainerssh</h1>
 
+<center><strong> ⚠️⚠️⚠️ This repository has been deprecated and has been merged into the [main ContainerSSH repository](https://github.com/ContainerSSH/ContainerSSH) all instances of `go.containerssh.io/libcontainerssh` should be replaced with go.containerssh.io/containerssh` as a drop-in replacement. No further versions of this library will be published, all future updates will be made in the main ContainerSSH repository. ⚠️⚠️⚠️ <center><strong>
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 [![FOSSA Status](https://app.fossa.com/api/projects/git%2Bgithub.com%2FContainerSSH%2Flibcontainerssh.svg?type=shield&issueType=license)](https://app.fossa.com/projects/git%2Bgithub.com%2FContainerSSH%2Flibcontainerssh?ref=badge_shield&issueType=license)
 
 This library is the core library of ContainerSSH and simultaneously serves as a library to integrate with ContainerSSH. This readme outlines the basics of using this library, for more detailed documentation please head to [containerssh.io](https://containerssh.io).