def create_cluster(clusterName=None):
    """
    Creates a new Amazon ECS cluster. By default, your account receives a default cluster when you launch your first container instance. However, you can create your own cluster with a unique name with the CreateCluster action.
    See also: AWS API Documentation
    
    Examples
    This example creates a cluster in your default region.
    Expected Output:
    
    :example: response = client.create_cluster(
        clusterName='string'
    )
    
    
    :type clusterName: string
    :param clusterName: The name of your cluster. If you do not specify a name for your cluster, you create a cluster named default . Up to 255 letters (uppercase and lowercase), numbers, hyphens, and underscores are allowed.

    :rtype: dict
    :return: {
        'cluster': {
            'clusterArn': 'string',
            'clusterName': 'string',
            'status': 'string',
            'registeredContainerInstancesCount': 123,
            'runningTasksCount': 123,
            'pendingTasksCount': 123,
            'activeServicesCount': 123
        }
    }
    
    
    """
    pass
