Add documentation for wwctl import

Signed-off-by: Stephen Simpson <ssimpson89@users.noreply.github.com>

userdocs/nodes/nodes.rst

@@ -199,3 +199,81 @@ overlays.
              passno: 0
 
 Resources can only be managed with ``wwctl node edit``.
+
+Importing Nodes From a File
+===========================
+
+You can import nodes into Warewulf by using the ``wwctl node import`` command. The
+file used must be in YAML or CSV format. 
+
+.. warning::
+   Importing a node configuration will fully overwrite the existing settings, 
+   including any customizations not present in the import file. If the node 
+   already exists and you wish to update it, ensure that the import file 
+   includes all the options you want to retain.
+
+CSV Import
+----------
+
+.. note::
+   As of Warewulf v4.6.1, the csv import functionality is broken and an 
+   `issue <https://github.com/warewulf/warewulf/issues/1862>`_
+   has been created to track this.
+
+The CSV file must have a header where the first field must always be the nodename, 
+and the rest of the fields are the same as the long commandline options. Network 
+device must have the form ``net.$NETNAME.$NETOPTION``. (e.g., ``net.default.ipaddr``). 
+Tags are currently not supported and must be added separately after the import. 
+
+As an example, the following CSV file:
+
+.. code-block:: csv
+
+   nodename,net.default.hwaddr,net.default.ipaddr,net.default.netmask,net.default.gateway,discoverable,image
+   n1,00:00:00:00:00:01,10.0.2.1,255.255.255.0,10.0.2.254,false,rockylinux-9
+
+This can be imported with the following command:
+
+.. code-block:: shell
+
+   wwctl node import --csv /path/to/nodes.csv
+
+YAML Import
+-----------
+
+The YAML file must be a mapping of node names to their attributes, where each node is represented as a dictionary of attributes. 
+To simplify the creation of the YAML file, you can use the wwctl node export command to export the current node configuration to a YAML file. 
+This exported file can serve as a template for creating new nodes.
+
+A minimal example of a YAML file looks like this:
+
+.. code-block:: yaml
+
+   n1:
+      profiles:
+         - default
+      image name: rockylinux-9
+      ipxe template: default
+      kernel:
+         args:
+            - quiet
+            - crashkernel=no
+            - nosplash
+            - console=ttyS0,115200
+      network devices:
+         default:
+            type: ethernet
+            device: eno1
+            hwaddr: "00:00:00:00:00:01"
+            ipaddr: 10.0.2.1
+            netmask: 255.255.255.0
+            gateway: 172.16.131.1
+            tags:
+            DNS1: 1.1.1.1
+      primary network: default
+
+This can be imported with the following command:
+
+.. code-block:: shell
+
+   wwctl node import /path/to/nodes.yaml