Add Helm convert plugin (#4766)

Signed-off-by: Etienne Tremel <etienne.tremel@container-solutions.com>

docs/related.md

@@ -32,6 +32,7 @@ or [pull request](https://github.com/helm/helm/pulls).
 - [Helm Diff](https://github.com/databus23/helm-diff) - Preview `helm upgrade` as a coloured diff
 - [Helm Value Store](https://github.com/skuid/helm-value-store) - Plugin for working with Helm deployment values
 - [Technosophos's Helm Plugins](https://github.com/technosophos/helm-plugins) - Plugins for GitHub, Keybase, and GPG
+- [helm-convert](https://github.com/ContainerSolutions/helm-convert) - Plugin to convert charts into Kustomize compatible packages
 - [helm-cos](https://github.com/imroc/helm-cos) - Plugin to manage repositories on Tencent Cloud Object Storage
 - [helm-edit](https://github.com/mstrzele/helm-edit) - Plugin for editing release's values
 - [helm-env](https://github.com/adamreese/helm-env) - Plugin to show current environment