Inviting a collaborator to a personal repository
You can send an invitation to collaborate in your repository directly to someone on GitHub..
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Ask for the username of the person you're inviting as a collaborator. 
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On GitHub, navigate to the main page of the repository. 
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Under your repository name, click Settings. If you cannot see the "Settings" tab, select the dropdown menu, then click Settings.  
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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. 
Next steps
- For reference information, see Permission levels for a personal account repository