Add Helm instructions for Vault

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diff --git a/kubernetes/namespaces/vault/README.md b/kubernetes/namespaces/vault/README.md
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+# Vault
+
+We deploy an instance of [HashiCorp
+Vault](https://developer.hashicorp.com/vault) to store various types of secret
+data used on the cluster.
+
+We use it to issue X509 certificates for mutual TLS setups.
+
+As well as this, the Helm chart used allows for secret injection based on the
+annotations present in pods deployed to the cluster. See more
+[here](https://developer.hashicorp.com/vault/docs/platform/k8s/injector)
+
+# Setup
+
+1. Add the Helm repository for HashiCorp:
+
+``` sh
+$ helm repo add hashicorp https://helm.releases.hashicorp.com
+"hashicorp" has been added to your repositories
+```
+
+2. Install Vault to the `vault` namespace using the following command:
+
+``` sh
+$ helm install --create-namespace vault hashicorp/vault --namespace vault
+...
+```
+
+3. Voila, Vault is deployed in the `vault` namespace.