GitHub for Unity 1.0 is the official release of a Unity editor extension designed to integrate Git functionalities within Unity versions 5.6, 2017.x, and 2018.x, providing an improved workflow for game development teams. It includes features like support for large files using Git LFS and file locking, allowing for efficient management of large assets and scene files. The update introduces enhancements such as improved file locking management, diffing support, reduced package size, update notifications, email sign-in, and better Git and Git LFS support for Mac users. The extension can be downloaded from the Unity Asset Store, and developers are encouraged to join the community by engaging with the GitHub for Unity repository and participating in discussions on Twitter.