feat(github-actions): add release workflow and README for project setup Introduced a GitHub Actions workflow to support multi-OS builds and releases, automating the creation and uploading of assets for the `conv` tool across different operating systems. Additionally, a README file has been added to guide users through the installation and usage of the tool, emphasizing its features like number conversion between various systems and handling multiple inputs efficiently. This change aims to enhance the project's usability and accessibility for potential users and contributors, providing clear instructions and automating the release process to ensure consistent builds.