You can put the project on GitHub from Xcode 9's source control navigator. Start by opening the source control navigator by choosing View > Navigators > Show Source Control Navigator or pressing Cmd-2.
Select the Remotes folder, right-click, and choose Create Remote on GitHub. On Xcode 10 the menu item is Create "ProjectName" Remote. A sheet similar to the following will open:
Since you added your GitHub account to Xcode, you can choose the account from the Account menu. If you hadn't added your GitHub account, you would choose Add a GitHub Account and enter your account name and password.
Give your repository a name and add a description if you want. Choose Public for the visibility unless you have a GitHub plan (paid or student) that allows private repositories. Click the Create button and your project will be on GitHub for the other people in your group to clone. They can clone the project by choosing Source Control > Clone.
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