added genders examples

userdocs/contents/example-templates.rst

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+================
+Useful templates
+================
+
+The examples directory contains some useful examples for day to day cluster admninstration.
+
+Genders
+=======
+
+The file `genders.ww` can be placed as `/etc/genders.ww` which will create a genders database which containts all nodes with their profile as key. Also for every user defined 'key' the 'tah' will be added. 
+
+.. Note: 
+
+A arbitrary tag with a key can be added to a node with
+
+.. code-block:: bash
+   wwctl node set --tagadd key=value n01
+   wwctl node set --tagadd key2='foo=baar' n01
+
+will result in genders file with following line
+
+
+.. code-block:: bash
+   n01: value,foo=baar
+