Add Render to list of xterm.js users

[crcastle]

Hi folks- Copying this over from an erroneous PR I made on the xtermjs.org website repo:

Hello xterm.js folks- Thanks for creating and maintaining this great project. This PR adds Render to the list of xterm.js real world uses.

We have been using xterm.js for a few years to give our users a command prompt for their deployed container. We also use it to show streaming build and runtime logs for user services.

[Tyriar]

Thanks 🙂