add minikube-echoserver docs

minikube-echoserver/README.md

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+# minikube-echoserver
+Example of running [echoserver](https://console.cloud.google.com/gcr/images/google-containers/GLOBAL/echoserver) on 
+minikube using pure terraform
+
+Prerequisites
+* [Terraform > 0.12](https://www.terraform.io/downloads.html)
+* [minikube > 1.5.2](https://kubernetes.io/docs/tasks/tools/install-minikube/)
+
+Steps:
+1. Start minikube: `minikube start`
+2. Clone repo: `git clone [email protected]:jhole89/terraform-k8s-example.git`
+3. Change to this directory: `cd minikube-echoserver`
+4. Initialise terraform: `terraform init`
+5. Apply terraform plan: `tf apply --auto-approve` - you should see the following output
+    ```
+    kubernetes_namespace.example_namespace: Creating...
+    kubernetes_namespace.example_namespace: Creation complete after 0s [id=example-app-namespace]
+    kubernetes_deployment.example_deployment: Creating...
+    kubernetes_deployment.example_deployment: Creation complete after 5s [id=example-app-namespace/example-app-deployment]
+    kubernetes_service.example_service: Creating...
+    kubernetes_service.example_service: Creation complete after 1s [id=example-app-namespace/example-app-service]
+
+    Apply complete! Resources: 3 added, 0 changed, 0 destroyed.
+
+    Outputs:
+
+    node_port = 31740
+    ```
+6. The plan outputs the `node_port` exposed through the kubernetes service (here it was 31740). You can now hit the 
+endpoint using curl: `curl $(minikube ip):31740`
+7. Once no longer required you can remove all resources: `terraform destroy --auto-approve`
+8. Stop minikube: `minikube stop`