Added {function} template, #419

examples/template_function.py

@@ -1,4 +1,8 @@
-""" Example showing how to use a custom function for osxphotos {function} template """
+""" Example showing how to use a custom function for osxphotos {function} template 
+    Use:  osxphotos export /path/to/export --filename "{function:/path/to/template_function.py::example}"
+
+    You may place more than one template function in a single file as each is called by name using the {function:file.py::function_name} format
+"""
 
 import pathlib
 from typing import List, Union
@@ -7,7 +11,7 @@ import osxphotos
 
 
 def example(photo: osxphotos.PhotoInfo, **kwargs) -> Union[List, str]:
-    """ example function for {function} template
+    """ example function for {function} template; adds suffix of # if photo has adjustments and ! if photo is a favorite
 
     Args:
         photo: osxphotos.PhotoInfo object