'Creates a new Amazon ECS cluster. By default, your account
will receive 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.
During the preview, each account is limited to two clusters.
:type cluster_name: string
:param cluster_name: The name of your cluster. If you do not specify a
name for your cluster, you will create a cluster named `default`.'

def create_cluster(self, cluster_name=None):

    params = {}
    if (cluster_name is not None):
        params['clusterName'] = cluster_name
    return self._make_request(action='CreateCluster', verb='POST', path='/', params=params)
