Added Codevolve.com to README

We use xterm.js for our courses at Codevolve.

README.md

@@ -32,6 +32,7 @@ Xterm.js is used in several world-class applications to provide great terminal e
 - [**WebSSH2**](https://github.com/billchurch/WebSSH2): A web based SSH2 client using `xterm.js`, socket.io, and ssh2.
 - [**Spyder Terminal**](https://github.com/spyder-ide/spyder-terminal): A full fledged system terminal embedded on Spyder IDE. 
 - [**Cloud Commander**](https://cloudcmd.io "Cloud Commander"): Orthodox web file manager with console and editor.
+- [**Codevolve**](https://www.codevolve.com "Codevolve"): Online platform for interactive coding and web development courses. Live container-backed terminal uses `xterm.js`.
 
 Do you use xterm.js in your application as well? Please [open a Pull Request](https://github.com/sourcelair/xterm.js/pulls) to include it here. We would love to have it in our list.