improve README.md

Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>

README.md

@@ -6,25 +6,36 @@ add them to the cart, and purchase them.
 
 ### Setup on GKE
 
-0. Make sure you have a Google Kubernetes Engine cluster and enabled Google
+1. Install:
-   Container Registry (GCR) on your GCP project:
+
+   - [gcloud](https://cloud.google.com/sdk/) + sign in to your account/project.
+   - kubectl (can be installed via `gcloud components install kubectl`)
+   - Docker (on Mac/Windows, install Docker for Desktop CE)
+   - [Skaffold](https://github.com/GoogleContainerTools/skaffold/#installation)
+
+1. Create a Google Kubernetes Engine cluster and make sure `kubectl` is pointing
+   to the cluster.
+
+1. Enable Google Container Registry (GCR) on your GCP project:
 
        gcloud services enable containerregistry.googleapis.com
     
+1. Configure docker to authenticate to GCR:
+
+       gcloud auth configure-docker -q
+
 1. Edit `skaffold.yaml`, prepend your GCR registry host (`gcr.io/YOUR_PROJECT/`)
    to all `imageName:` fields.
 
-2. Edit the Deployment manifests at `kubernetes-manifests` directory and update
+1. Edit the Deployment manifests at `kubernetes-manifests` directory and update
    the `image` fields to match the changes you made in the previous step.
 
-3. Install [Skaffold] and `skaffold run`. This builds the container
+1. Run `skaffold run`. This builds the container
    images, pushes them to GFR, and deploys the application to Kubernetes.
 
-4.  Find the IP address of your application:
+1.  Find the IP address of your application:
 
         kubectl get service frontend-external
 
     then visit the application on your browser to confirm
     installation.
-
-[Skaffold]: https://github.com/GoogleContainerTools/skaffold/#installation