add node imges descriptions

Author: sp-yduck

README.md

@@ -61,6 +61,18 @@ make delete-workload-cluster
 
 - Supports custom cloud-config (user data). CAPPX uses ssh for bootstrapping nodes so it can applies custom cloud-config that can not be achieved by only Proxmox API.
 
+### Node Images
+
+CAPPX is compatible with `qcow2` image. You can build your own node image and use it for `ProxmoxMachine`.
+
+CAPPX relies on a few prerequisites which have to be already installed in the used operating system images, e.g. a container runtime, kubelet, kubeadm,.. .
+
+To build your custom node image, you can use [kubernetes-sigs/image-builder](https://github.com/kubernetes-sigs/image-builder) project. 
+
+Also there are some available out-of-box images published other communities such as [Metal3](https://github.com/metal3-io). For example https://artifactory.nordix.org/ui/native/metal3/images/. Example MD can be found [metal3-ubuntu2204-k8s127.yaml](examples/machine_deployment/metal3-ubuntu2204-k8s127.yaml).
+
+If it isn't possible to pre-install those prerequisites in the image, you can always deploy and execute some custom scripts through the `ProxmoxMachine.spec.cloudInit` or `KubeadmConfig.spec.preKubeadmCommands` etc. . Example MD can be found [ubuntu2204.yaml](examples/machine_deployment/ubuntu2204.yaml).
+
 ## Compatibility
 
 ### Proxmox-VE REST API