add README.md

README.md

+## Ansible playbook for k8s cluster installation
+
+### Usage
+* create the inventory.ini
+```
+[cp]
+{ip}
+
+[nodes]
+{ip}
+{ip}
+{ip}
+```
+* create the hosts file to alternate the vm's /etc/hosts file
+```
+{ip} dk8scp1
+{ip} dk8snode1
+{ip} dk8snode2
+{ip} dk8snode3
+
+```
+* execute ansible-playbook
+`ansible-playbook install_k8s_nodes.yml -i inventory.ini`
+
+
+