Add README for deployment stuff

Author: Jody McIntyre

deployment/README.md

@@ -0,0 +1,26 @@
+Deployment to GKE using Docker and Kubernetes is a work in progress.
+
+Build & push:
+```
+docker build -t grc.io/jody-imageserver-test/imageserver:v4 .
+gcloud docker -- push gcr.io/jody-imageserver-test/imageserver:v4
+```
+
+Provision & deploy:
+```
+gcloud beta container clusters create imageserver --enable-autoscaling --min-nodes=1 --max-nodes=3 --num-nodes=1 --zone=us-central1-a --additional-zones=us-central1-b,us-central1-c --enable-autoupgrade --cluster-version=1.7.3
+# Note: "min", "num", and "max" nodes sets the number PER ZONE.
+kubectl apply -f deployment
+kubectl get service imageserver # Will show the load balancer IP when it's ready
+```
+
+Rolling update (and rollback if needed):
+```
+kubectl set image deployments/imageserver imageserver-app=gcr.io/jody-imageserver-test/imageserver:v4
+kubectl rollout undo deployments/imageserver
+```
+
+Cleanup
+```
+gcloud container clusters delete imageserver
+```