code: func (s *UserService) Get(username string) (*User, *Response, error) {
  	apiEndpoint := fmt.Sprintf("/rest/api/2/user?username=%s", username)
  	req, err := s.client.NewRequest("GET", apiEndpoint, nil)
  	if err != nil {
  		return nil, nil, err
  	}
  
  	user := new(User)
  	resp, err := s.client.Do(req, user)
  	if err != nil {
  		return nil, resp, NewJiraError(resp, err)
  	}
  	return user, resp, nil
  }
docs: // Get gets user info from JIRA
  //
  // JIRA API docs: https://docs.atlassian.com/jira/REST/cloud/#api/2/user-getUser