Hass.io and homegear addon - beginner questions

Hi,

I’m really new to hass.io and try to get my homematic (via homegear) set up working.
I installed the addon (https://github.com/yeah/hassio-addons) but what is the next step?
I found the configuration frame in the addon but is just a {}… What to enter here or how to get this working (missing some documentation here…)
Would be great to get some step by step advise!

Thanks!
Markus