AWS IoT Core registry adds additional AWS CloudFormation resource types

AWS CloudFormation now supports AWS IoT Core thing group, thing type and billing group resources. [AWS CloudFormation](https://aws.amazon.com/cloudformation/) is an infrastructure as code (IaC) service that allows you to easily model, provision, and manage AWS and third-party resources. You can now use an AWS CloudFormation template to pre-configure and deploy AWS IoT Core registry resources for your targeted Internet of Things (IoT) solution in a secure, efficient, and repeatable way. AWS IoT Core is a fully managed service that lets you connect billions of Internet of Things (IoT) devices to AWS without provisioning and managing cloud infrastructure. AWS IoT Core provides a [registry](https://docs.aws.amazon.com/iot/latest/developerguide/iot-thing-management.html) to establish an identity for devices and track metadata, such as the devices’ attributes and capabilities. Within this registry, you can use ‘thing group ([static thing group](https://docs.aws.amazon.com/iot/latest/developerguide/thing-groups.html) and [dynamic thing group](https://docs.aws.amazon.com/iot/latest/developerguide/dynamic-thing-groups.html))’ and ’[thing type](https://docs.aws.amazon.com/iot/latest/developerguide/thing-types.html)’ to organize things, and use ‘[billing group](https://docs.aws.amazon.com/iot/latest/developerguide/tagging-iot-billing-groups.html)’ to tag resources for cost and usage allocation. Thing groups, billing groups and thing types in AWS CloudFormation templates are available in [all regions where AWS IoT Core](https://aws.amazon.com/about-aws/global-infrastructure/regional-product-services/) is available. All resource types in IoT Core registry are now supported by AWS CloudFormation. For more information, visit the [IoT resource type reference](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/AWS%5FIoT.html).