Added class and os alternates

.oh-my-zsh/plugins/helm/README.md

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+# Helm plugin
+
+This plugin adds completion for [Helm](https://helm.sh/), the Kubernetes package manager.
+
+To use it, add `helm` to the plugins array in your zshrc file:
+
+```zsh
+plugins=(... helm)
+```

.oh-my-zsh/plugins/helm/helm.plugin.zsh

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+# Autocompletion for helm.
+#
+# Copy from kubectl : https://github.com/pstadler
+
+if [ $commands[helm] ]; then
+  source <(helm completion zsh)
+fi