update readme

hack/test/README.md

@@ -1,6 +1,7 @@
 # Testing Prometheus Storage Adapter for Wavefront
 
 1. Update proxy with YOUR_API_TOKEN and YOUR_CLUSTER in hack/test/6-wavefront-proxy.yaml.
-2. Apply all yamls within hack/test by
+2. Create namespace by `kubectl create namespace monitoring`
+3. Apply all yamls within hack/test by
    `kubectl apply -f hack/test/`
-3. The prometheus metrics should now be available under the metric name with prefix "prometheus."
+4. The prometheus metrics should now be available under the metric name with prefix "prometheus."