Add AWS auth and secret docs

Add docs to README explaining how to enable and use aws auth and aws
client secrets.

helm/standalone.yaml

@@ -3,19 +3,33 @@ global:
 
 server:
 
+  extraSecretEnvironmentVars:
+    - envName: VAULT_TOKEN
+      secretName: auto-unseal-token
+      secretKey: VAULT_TOKEN
+
   standalone:
     enabled: true
     config: |
-      ui = true
+        ui = true
 
-      listener "tcp" {
-        tls_disable = 1
-        address = "[::]:8200"
-        cluster_address = "[::]:8201"
-      }
-      storage "file" {
-        path = "/vault/data"
-      }
+        listener "tcp" {
+          tls_disable = 1
+          address = "[::]:8200"
+          cluster_address = "[::]:8201"
+        }
+
+        seal "transit" {
+          address = "https://pi-vault.dnet:8200"
+          disable_renewal = "false"
+          key_name = "autounseal"
+          mount_path = "transit/"
+          tls_skip_verify = "true"
+        }
+
+        storage "file" {
+          path = "/vault/data"
+        }
 
   dataStorage:
     enabled: true