Add an overview of currently active (live) users

I think an overview of the currently active users would be really informative.

When you click on
![image](
on the top, you open an overview with a table similar to the one in "Sessions" where you see the users, their origin, device and so on.
Also interesting to see would be which page they're currently on and a link to their session.

so no rocket science here but would be really informative. :-)

BONUS: A time graph showing how many active users there were in the time frames.

Mockup:

![image](

What do you think?