Add docs for 3rd-party tools

docs/user-guide/third-party-tools.md

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+---
+assignees:
+- janetkuo
+
+---
+
+* TOC
+{:toc}
+
+## Helm
+
+[Kubernetes Helm](https://github.com/kubernetes/helm) is a tool for managing packages of pre-configured
+Kubernetes resources, aka Kubernetes charts.
+
+Use Helm to: 
+
+* Find and use popular software packaged as Kubernetes charts
+* Share your own applications as Kubernetes charts
+* Create reproducible builds of your Kubernetes applications
+* Intelligently manage your Kubernetes manifest files
+* Manage releases of Helm packages
+
+## Kompose 
+
+[`kompose`](https://github.com/skippbox/kompose) is a tool to help users familiar with `docker-compose`
+move to Kubernetes. It takes a Docker Compose file and translates it into Kubernetes objects. `kompose`
+is a convenient tool to go from local Docker development to managing your application with Kubernetes.