Mention how to install Kustomize.

It's recommended to install the standalone version of kustomize rather
than using the version that ships with kubectl because that version is
typically very old and doesn't match the docs.

README.md

@@ -108,7 +108,7 @@ $ alias kubectl="minikube kubectl --"
 
 ### Basic Install
 
-Once you have a running Kubernetes cluster, you can deploy AWX Operator into your cluster using [Kustomize](https://kubectl.docs.kubernetes.io/guides/introduction/kustomize/).
+Once you have a running Kubernetes cluster, you can deploy AWX Operator into your cluster using [Kustomize](https://kubectl.docs.kubernetes.io/guides/introduction/kustomize/). Follow the instructions here to install the latest version of Kustomize: https://kubectl.docs.kubernetes.io/installation/kustomize/
 
 First, create a file called `kustomization.yaml` with the following content:
 
@@ -165,7 +165,7 @@ So we don't have to keep repeating `-n awx`, let's set the current namespace for
 $ kubectl config set-context --current --namespace=awx
 ```
 
-Next, create a file named `awx-demo.yml` in the same folder with the suggested content below. The `metadata.name` you provide will be the name of the resulting AWX deployment.
+Next, create a file named `awx-demo.yaml` in the same folder with the suggested content below. The `metadata.name` you provide will be the name of the resulting AWX deployment.
 
 **Note:** If you deploy more than one AWX instance to the same namespace, be sure to use unique names.