take you to the recipe, with a clear list of ingredients and how to prepare them. They have a photo with the finished product (which you hope you can match), and that's it. Some apps even have set-by-set video instructions that will walk you through the cooking process.
Things you may want to cover:
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Ruby version
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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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...