Simplified analogue of the site stackoverflow.com having the following features:
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ask questions on issues of interest,
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give answers,
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vote for the answer,
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attach files to questions and answers (ActiveStorage),
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authenticate with third party services (GitHub, Vkontakte)
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REST API.
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Full test coverage (TDD/BDD, Capybara, RSpec) Used gems: devise, slim-rails, cancancan, OmniAuth