CLI could initialize the scaffolding for releasing React libs

Description

Releasing open source React components requires heavy scaffolding. Once we are done with tests, CI, and examples for react-idle, we could use that setup for other similar projects

React Idle setup is somewhat opinionated but to a reasonable degree. For instance:

• Flow is set up. Not all projects require flow, but having type safety in an open source project is extremely helpful
• code formatting with eslint and prettier should stay there, but tweaks are possible
• rollup is used over webpack, which may introduce a learning curve. Still, rollup has certain advantages for libraries, which was also heavily researched by React team
• testing suite may prove to be too specific, but we'll see that it's reasonable enough
• we like to work with different CIs and will need to pick one

This may require a separate repo. It would be interesting to create something like create-react-app so it can be maintained from one place

Comece revisando a configuração existente do react-idle, incluindo seus testes, a configuração de CI, os exemplos, o uso de Flow e as configurações do ESLint e do Rollup. Compare essa configuração com a CLI proposta no estilo create-react-app e decida se o scaffold deve ficar neste repositório ou em um repositório separado. O trabalho estará concluído quando o scaffold compatível, a escolha de CI e o escopo dos padrões reutilizáveis estiverem claramente definidos.