To manage Unity project version-control using GitHUb for Unity, do the following:
- Start a new Unity project.
- Open the Asset Store panel, choose menu: Window | General | Asset Store.
- In the Asset Store, search for GitHub for Unity, download and import this into your project:
- If there is a popup about a newer version, accept it and download the newer version. This will download as a Unity package (probably in your Downloads folder), which you can then import into your Unity project.
- Once imported, you should see a Plugins | GitHub folder in your Project panel. You will also now see two new items on your Window menu, for ...