Add documentation updates

README.md

@@ -1,14 +1,41 @@
 # Hetzner Kubeadm cluster
 
+This Terraform module allows you to very easily spin up a Kubadm provisioned Kubernetes cluster on Hetzner Cloud. It creates one master node and one worker node.
+
 ### Why?
 
-kubeadm lets you spin up Kubernetes cluster very easily with little effort, using these Terraform scripts and Hetzner cloud you can easily spin up a master and worker node in seconds with all of the required configuration.
+Kubeadm is covered a lot in the Kubernetes Certified Adminstrator exam [CKA](https://www.cncf.io/certification/cka/) - spinning up this cluster gives you practice for that exam and Kubernetes in general.
+
+Kubeadm is used a lot in many productions for provisioning Kubernetes clusters in the cloud, on-prem, bare metal etc. 
+
+[kubeadm](https://github.com/kubernetes/kubeadm)
+
 
 ### What do I need to do?
 
+If you haven't already, setup an account at [Hetzner Sign Up](https://accounts.hetzner.com/account/masterdata)
+
+You can call this module in your Terraform project like so:
+
+```bash
+module "hetzner_kubeadm" {
+  source =  "git@github.com:dannyburke1/hetzner-kubeadm.git"
+}
+```
+
 This module assumes that you have a public key in `~/.ssh/id_rsa.pub` and a Hetzner API token ready to be used.
 
 Once you've updated the api key variable, you're ready to run `terraform apply` and spin up these nodes.
 
 You can then SSH to the master with the `root` user and begin following the kubeadm cluster walkthrough. 
 
+### Costs
+
+Kubeadm has resource requirements for it to run:
+- 2GB Ram
+- 2vCPU Cores for the master/control plane node.
+
+This module has the correct instance sizes to run these instances with an estimated cost of:
+
+8.38 euros p/month in Helsinki region for a master and control plane node.
+