docs: Add nodeadm to K8S_DISTRIBUTION in README.md (#346)

I believe this can be added to the table now?

Author: benradstone

README.md

@@ -124,7 +124,7 @@ cp .arg.template .arg
 | OS_DISTRIBUTION             | OS distribution of your choice. For example, it can be `ubuntu`, `opensuse-leap`, `rhel` or `sles`                                                                                                                                                                                                                                             | String  | `ubuntu`                   |
 | IMAGE_REPO                  | Image repository name in your chosen registry.                                                                                                                                                                                                                                                                                                 | String  | `$OS_DISTRIBUTION`         |
 | OS_VERSION                  | OS version. For Ubuntu, the possible values are `20`, and `22`. Whereas for openSUSE Leap, the possible value is `15.6`. For sles, possible values are `5.4`. This example uses `22` for Ubuntu.                                                                                                                                               | String  | `22`                       |
-| K8S_DISTRIBUTION            | Kubernetes distribution name. It can be one of these: `k3s`, `rke2`, `kubeadm`, or `kubeadm-fips`.                                                                                                                                                                                                                                             | String  | `k3s`                      |
+| K8S_DISTRIBUTION            | Kubernetes distribution name. It can be one of these: `k3s`, `rke2`, `kubeadm`, `kubeadm-fips`, or `nodeadm`.                                                                                                                                                                                                                                  | String  | `k3s`                      |
 | ISO_NAME                    | Name of the Edge installer ISO image. In this example, the name is _palette-edge-installer_.                                                                                                                                                                                                                                                   | String  | `palette-edge-installer`   |
 | ARCH                        | Type of platform to use for the build. Used for Cross Platform Build (arm64 to amd64 as example).                                                                                                                                                                                                                                              | string  | `amd64`                    |
 | BASE_IMAGE                  | Base image to be used for building installer and provider images.                                                                                                                                                                                                                                                                              | String  |                            |