Feature/coin (#623)
Feature/coin (#623)

* add coin.py

* add example settings

* refactor whitespaces for merge requirements

* update class docstring

Arvedui/i3pystatus,teto/i3pystatus,enkore/i3pystatus,fmarchenko/i3pystatus,teto/i3pystatus,Arvedui/i3pystatus,drwahl/i3pystatus,facetoe/i3pystatus,facetoe/i3pystatus,enkore/i3pystatus,drwahl/i3pystatus,fmarchenko/i3pystatus