Helm must be installed to use the charts. Please refer to Helm's documentation to get started.
Once Helm is set up properly, add the repo as follows:
helm repo add itzg https://itzg.github.io/minecraft-server-charts/
You can then run helm search repo itzg
to see the charts.
helm install --name your-release itzg/minecraft
Also see helm hub for a complete list.