Added Cloudsmith to Additional Tools

Hi! This PR adds a link to [Cloudsmith](https://cloudsmith.io), which is a package management service SaaS. It's commercial, but it's completely free for open-source and it has generous free tiers otherwise. It has first-class support for Helm (and many other package formats, such as npm, Docker etc), plus org/teams management, granular access controls, private repositories, repository-specific entitlements, a worldwide content distribution network, webhooks, access logs, etc. Thank you. :)

Full disclosure: I work at Cloudsmith. \o/

Signed-off-by: Alan Carson <acarson@cloudsmith.io>

docs/related.md

@@ -68,6 +68,7 @@ Tools layered on top of Helm or Tiller.
 - [Armada](https://github.com/att-comdev/armada) - Manage prefixed releases throughout various Kubernetes namespaces, and removes completed jobs for complex deployments. Used by the [Openstack-Helm](https://github.com/openstack/openstack-helm) team.
 - [ChartMuseum](https://github.com/chartmuseum/chartmuseum) - Helm Chart Repository with support for Amazon S3 and Google Cloud Storage
 - [Chartify](https://github.com/appscode/chartify) - Generate Helm charts from existing Kubernetes resources.
+- [Cloudsmith](https://cloudsmith.io/l/helm-repository/) - Fully managed SaaS offering private Helm Chart Repositories
 - [Codefresh](https://codefresh.io) - Kubernetes native CI/CD and management platform with UI dashboards for managing Helm charts and releases
 - [Cog](https://github.com/ohaiwalt/cog-helm) - Helm chart to deploy Cog on Kubernetes
 - [Drone.io Helm Plugin](http://plugins.drone.io/ipedrazas/drone-helm/) - Run Helm inside of the Drone CI/CD system