Adding content above topmenu

Hi,
I need to add content above top menu and need it to be responsive as it is now. http://tiendanueva.negre.es/
The content will be social networks and some contact text, something similar to this website http://www.nest.co.uk/
Would it be difficult to do it?

Depends on how much You would like to change it.
You will be definitly interested in file located in:
/templates/gk_storebox/layouts/default.php
I would recomment to add your code inside #gkHeader element.
As with responsive - you should edit:
/templates/gk_storebox/css/tablet.css
/templates/gk_storebox/layouts/mobile.css
and add there classes for smaller screens.
Css for standard can be added to override.css (enable it in template settings in first place).

Thank you very much Cyberek, I will take it into account when need to apply changes, any doubt will let you know!

Kind Regards,