added topology legend to Zenmap

[surajhande <surajhande555 () gmail com>]

Hi,
I've added a topology legend window to the Zenmap topology page and
raised a pull request for the github repo. Please review and suggest any
changes.

Regards.
_______________________________________________
Sent through the dev mailing list
https://nmap.org/mailman/listinfo/dev
Archived at http://seclists.org/nmap-dev/