code: func (s *RepositoriesService) CreateProject(ctx context.Context, owner, repo string, opt *ProjectOptions) (*Project, *Response, error) {
  	u := fmt.Sprintf("repos/%v/%v/projects", owner, repo)
  	req, err := s.client.NewRequest("POST", u, opt)
  	if err != nil {
  		return nil, nil, err
  	}
  
  	// TODO: remove custom Accept headers when APIs fully launch.
  	req.Header.Set("Accept", mediaTypeProjectsPreview)
  
  	project := &Project{}
  	resp, err := s.client.Do(ctx, req, project)
  	if err != nil {
  		return nil, resp, err
  	}
  
  	return project, resp, nil
  }
docs: // CreateProject creates a GitHub Project for the specified repository.
  //
  // GitHub API docs: https://developer.github.com/v3/projects/#create-a-repository-project