add faq_rus

[avsakharov]

This PR contains the Russian version of the faq bot.

[avsakharov]

@RLKRo During the execution of pytest test.py an error appears:

candidate_response = text='I found similar questions in my database:' ui='{'buttons': [{'text': 'Why should I use Arch?', 'payload': 'Why should I use Arch?'}, {'text': 'Why should I not use Arch?', 'payload': 'Why should I not use Arch? '}, {'text': 'What architectures does Arch support?', 'payload': 'What architectures does Arch support?'}, {'text': 'What is Arch Linux?', 'payload': 'What is Arch Linux?'}], 'is_inline': True, 'row_width': 3}'
E reference_response = text='I found similar questions in my database:' ui='{'buttons': [{'text': 'Why should I use Arch?', 'payload': 'Why should I use Arch?'}, {'text': 'Why should I not use Arch?', 'payload': 'Why should I not use Arch?'}], 'is_inline': True, 'row_width': 3}'
E candidate_response != reference_response

I see that candidate_response != reference_response, but I don't know how to add items to reference_response. Can you help me fix it? The bot runs, but crashes at the button show stage.

Update: I think, I fix that mistake.