Developed a comprehensive onboarding and quickstart guide for the ConexaoTreinamento/conexao-treinamento repository, focusing on streamlining the project setup process for new contributors. The work centered on creating detailed documentation in Markdown, outlining prerequisites such as Docker, Java JDK 21, Node.js, and pnpm, and providing step-by-step instructions for running the database, backend, and frontend services in separate terminals. By including OS-specific notes and clarifying the end-to-end setup flow, the documentation standardized the development environment and reduced onboarding time. This effort improved repository quality, enhanced repeatability, and supported developer productivity through clear, centralized, and versioned project setup instructions.