Add Tanzu config (#130)

## Purpose
Add Yaml file referenced by docs for configuring a cluster

## Does this introduce a breaking change?
<!-- Mark one with an "x". -->
```
[ ] Yes
[x] No
```

## Pull Request Type
What kind of change does this Pull Request introduce?

<!-- Please check the one that applies to this PR using "x". -->
```
[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[x] Documentation content changes
[ ] Other... Please describe:
```

Author: dominicbetts

samples/tanzu-config/psa.yaml

@@ -0,0 +1,60 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: azure-arc
+  labels:
+    app.kubernetes.io/managed-by: Helm
+    pod-security.kubernetes.io/audit: privileged
+    pod-security.kubernetes.io/enforce: privileged
+  annotations:
+    meta.helm.sh/release-name: azure-arc
+    meta.helm.sh/release-namespace: azure-arc-release
+--- 
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: arc-workload-identity
+  labels:
+    pod-security.kubernetes.io/audit: privileged
+    pod-security.kubernetes.io/enforce: privileged
+--- 
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: azure-arc-containerstorage
+  labels:
+    pod-security.kubernetes.io/audit: privileged
+    pod-security.kubernetes.io/enforce: privileged
+--- 
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: azure-arc-acstor
+  labels:
+    pod-security.kubernetes.io/audit: privileged
+    pod-security.kubernetes.io/enforce: privileged
+--- 
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: azure-extensions-usage-system
+  labels:
+    pod-security.kubernetes.io/audit: privileged
+    pod-security.kubernetes.io/enforce: privileged
+--- 
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: azure-secret-store
+  labels:
+    pod-security.kubernetes.io/audit: privileged
+    pod-security.kubernetes.io/enforce: privileged
+--- 
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: azure-iot-operations
+  labels:
+    pod-security.kubernetes.io/audit: privileged
+    pod-security.kubernetes.io/enforce: privileged
+