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 3.0.2
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System dependencies
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Configuration
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Database creation https://docs.mongodb.com/mongoid/current/tutorials/getting-started-rails/#create-new-application
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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 bundle install rails serve
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...