def get_commit(repositoryName=None, commitId=None):
    """
    Returns information about a commit, including commit message and committer information.
    See also: AWS API Documentation
    
    
    :example: response = client.get_commit(
        repositoryName='string',
        commitId='string'
    )
    
    
    :type repositoryName: string
    :param repositoryName: [REQUIRED]
            The name of the repository to which the commit was made.
            

    :type commitId: string
    :param commitId: [REQUIRED]
            The commit ID.
            

    :rtype: dict
    :return: {
        'commit': {
            'treeId': 'string',
            'parents': [
                'string',
            ],
            'message': 'string',
            'author': {
                'name': 'string',
                'email': 'string',
                'date': 'string'
            },
            'committer': {
                'name': 'string',
                'email': 'string',
                'date': 'string'
            },
            'additionalData': 'string'
        }
    }
    
    
    :returns: 
    (string) --
    
    """
    pass
