Added link to another slack group (#598)
Added link to another slack group (#598)

* added link to another one slack group
* fixed some minor issues in markdown
* reordered chats alphabetically

Co-authored-by: Evgeniy Sokolov <0779bf8834670e88db7da5bd432291388ec3abab@gmail.com>
ewgRa/de_faq,ewgRa/de_faq