chore: Update Exivity Helm Chart documentation (#57)

* Autoformat values.yaml

Signed-off-by: Steffen Exler <steffen@exivity.com>

* Update docs

Signed-off-by: Steffen Exler <steffen@exivity.com>

* Update Exivity Helm Chart documentation

Signed-off-by: Steffen Exler <steffen@exivity.com>

* empty commit

* chore: Remove spaces in values.yaml

Signed-off-by: Steffen Exler <steffen@exivity.com>

* chore: Update some docs

Signed-off-by: Steffen Exler <steffen@exivity.com>

* chore: Update values.yaml license for production environments

The values.yaml file has been modified to set the license to the actual license for production environments. This change ensures that the correct license is used when deploying the application. The previous "demo" license is no longer used for production environments.

Co-authored-by: Steffen Exler <steffen@exivity.com>
Signed-off-by: Steffen Exler <steffen@exivity.com>

---------

Signed-off-by: Steffen Exler <steffen@exivity.com>

README.md

@@ -1,5 +1,56 @@
-# Exivity helm charts for Kubernetes
+# Exivity Helm Chart
 
-Please refer to the
-[Kubernetes article on the Exivity documentation](https://docs.exivity.com/Getting%20Started/Installation/Kubernetes)
-to get started with the Exivity helm charts.
+[Exivity Installation Guide](https://docs.exivity.com/getting%20started/installation/kubernetes/)
+
+## Overview
+
+This Helm chart deploys Exivity, a comprehensive cloud metering and billing solution, on Kubernetes clusters.
+
+## Prerequisites
+
+### NFS Setup
+
+To use NFS as a storage solution for Exivity, install the NFS server provisioner using Helm:
+
+```bash
+helm repo add nfs-ganesha-server-and-external-provisioner https://kubernetes-sigs.github.io/nfs-ganesha-server-and-external-provisioner/
+helm install nfs-server nfs-ganesha-server-and-external-provisioner/nfs-server-provisioner \
+    --namespace nfs-server \
+    --create-namespace \
+    --wait \
+    --set persistence.enabled=true \
+    --set persistence.size=5Gi \
+    --set storageClass.name=nfs-client \
+    --set storageClass.allowVolumeExpansion=true \
+    --set 'storageClass.mountOptions[0]=nfsvers=4.2' \
+    --set 'storageClass.mountOptions[1]=rsize=4096' \
+    --set 'storageClass.mountOptions[2]=wsize=4096' \
+    --set 'storageClass.mountOptions[3]=hard' \
+    --set 'storageClass.mountOptions[4]=retrans=3' \
+    --set 'storageClass.mountOptions[5]=proto=tcp' \
+    --set 'storageClass.mountOptions[6]=noatime' \
+    --set 'storageClass.mountOptions[7]=nodiratime'
+```
+
+## Installation
+
+### Add Helm Repository
+
+To add the Exivity Helm repository:
+
+```bash
+helm repo add exivity https://charts.exivity.com
+```
+
+### Install the Chart
+
+To install the chart with the release name `exivity` in the `exivity` namespace, using the previously set up NFS storage class:
+
+```bash
+helm upgrade --install exivity ./charts/exivity \
+    --namespace exivity \
+    --create-namespace \
+    --wait \
+    --timeout $(HELM_TIMEOUT) \
+    --set storage.storageClass=nfs-client
+```