Verify if command is running in tmux

[mr-karan]

/api/verify/tmux <- should return if the command which was specified in the course, is running in a tmux session or not.

Use pstree / ps to determine.

Possible responses:

{
    "status": "success",
    "data": {}
}

If command is running but not in `tmux:

{
    "status": "error",
    "message": "`command` is running but not in `tmux`"
}

{
    "status": "error",
    "message": "tmux is not running"
}