This README would normally document whatever steps are necessary to get the application up and running.
Things you may want to cover:
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Ruby version
ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-darwin17]
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Rails version
Rails 4.2.4
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System dependencies
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Configuration
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Database creation
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Database initialization
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How to run the test suite
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Services (job queues, cache servers, search engines, etc.)
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Deployment instructions
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…
Please feel free to use a different markup language if you do not plan to run rake doc:app.