Adds refs

02-NETPOL.md

@@ -4,6 +4,11 @@
 
 - Have `kubectl` working against minikube
 
+## References
+
+- https://kubernetes.io/docs/concepts/services-networking/network-policies/
+- https://speakerdeck.com/alp/kubernetes-network-policies
+
 # Setup
 
 1. Bring up a new redis server in the `default` namespace