参考 https://qiita.com/Hijiri-K/items/c3774c72a2cb68e1a720
https://railsguides.jp/action_cable_overview.html
https://qiita.com/port-development/items/120b2bee0cef505a4005
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
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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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...