Inviting a collaborator to a personal repository
You can send an invitation to collaborate in your repository directly to someone on GitHub, or to the person's email address.
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Ask for the username of the person you're inviting as a collaborator. If they don't have a username yet, they can sign up for GitHub. For more information, see 在 GitHub 上创建帐户. 
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在 GitHub 上,导航到存储库的主页面。 
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在仓库名称下,单击 “Settings”****。 如果看不到“设置”选项卡,请选择“”下拉菜单,然后单击“设置”。  
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In the "Access" section of the sidebar, click Collaborators. 
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Click Add people. 
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In the search field, start typing the name of person you want to invite, then click a name in the list of matches. 
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Click Add NAME to REPOSITORY. 
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The user will receive an email inviting them to the repository. Once they accept your invitation, they will have collaborator access to your repository. 
Next steps
- For reference information, see Permission levels for a personal account repository