Add ShellHub to Gateways and terminal sharing (#2516)

Signed-off-by: Domarys Correa <domaryscorrea@gmail.com>

README.md

@@ -863,6 +863,7 @@ _Games, game servers and control panels._
 - [Neko](https://github.com/nurdism/neko) - A self hosted virtual browser (rabb.it clone) that runs in Docker. `Apache-2.0` `Docker/Go`
 - [oneye](https://oneye-project.org/) - Cloud software to access your data from everywhere with any browser. ([Demo](https://wiki.oneye-project.org/0.9:demo), [Source Code](https://github.com/oneye/oneye)) `AGPL-3.0` `PHP`
 - [OS.js](https://www.os-js.org/) - Desktop implementation for your browser with a fully-fledged window manager, Application APIs, GUI toolkits and filesystem abstraction. ([Demo](https://demo.os-js.org/), [Source Code](https://github.com/os-js/OS.js)) `BSD-2-Clause` `Nodejs`
+- [ShellHub](https://www.shellhub.io) - ShellHub is a modern SSH server for remotely accessing linux devices via command line (using any SSH client) or web-based user interface, designed as an alternative to sshd. Think ShellHub as centralized SSH for the the edge and cloud computing. ([Source Code](https://github.com/shellhub-io/shellhub)) `Apache-2.0` `Go/Other`
 - [Sshwifty](https://github.com/nirui/sshwifty) - Sshwifty is a SSH and Telnet connector made for the Web. `AGPL-3.0` `Go/Docker`
 - [tmate](https://tmate.io/) - Instant terminal sharing. ([Source Code](https://github.com/tmate-io/tmate)) `ISC` `C`