Added examples

Author: droans

extended_macro/example/example.py

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+def repeat_back(rept):
+    return rept + ' ' + rept

extended_macro/example/function_config.yaml

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+functions:
+  repeater:                                             # The name which will be used in the GCode to call the function. Must be unique.
+    path: /home/pi/klipper_functions/example.py         # Location of Python script. Must be an absolute path
+    function: repeat_back                               # The actual name of the Python function

extended_macro/example/klipper_functions.cfg

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+# Extended_template is used to define the path to your Function Config
+[extended_template]
+path: /home/pi/klipper_functions/function_config.yaml
+
+[extended_macro REPEAT_MSG]
+gcode:
+    {% set rpt = params.MSG %}
+    M118 {repeater(rpt)}