Add userspace chart and docs

This allows easy creation of user namespaces with limited permissions.

helm/namespace/templates/resourcequota.yaml

@@ -0,0 +1,12 @@
+apiVersion: v1
+kind: ResourceQuota
+metadata:
+  name: default
+  namespace: {{ .Release.Name }}
+spec:
+  hard:
+    requests.cpu: "8"
+    requests.memory: "8Gi"
+    limits.cpu: "16"
+    limits.memory: "16Gi"
+    requests.storage: "500Gi"