Add Helm Chart (#454)

docs/installation/kubernetes.md

@@ -0,0 +1,15 @@
+# Install on Kubernetes
+
+A [Helm](https://helm.sh) chart is available to install Opengist on a Kubernetes cluster.
+Check the [Helm documentation](https://helm.sh/docs/) for more information on how to use Helm.
+
+A non-customized installation of Opengist can be done with:
+
+```bash
+helm repo add opengist https://helm.opengist.io
+ 
+helm install opengist opengist/opengist
+```
+
+Refer to the [Opengist chart](https://github.com/thomiceli/opengist/tree/master/helm/opengist) for more information 
+about the chart and to customize your installation.