Add an exemple in EXAMPLES.md

EXAMPLES.md

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+# Exemple for automatic widget inclusion
+
+First you can verify that all widgets are found with the `listwidget` command.\
+Then the `makewidget` command will create a file `content/templates/<engine>/allwidgets.html`, that groups all the widgets found, and is automatically imported as `widgets` in all pages.\
+
+The line `{% import 'allwidgets.html' as widgets %}` is added at the beginning of each `Body` section of pages.
+
+For instance, if we have 3 widgets : `navbar.html`, `header.html` and `footer.html` we can use them in pages :
+
+```jinja
+{{ widgets.navbar(...) }}
+{{ widgets.header(...) }}
+{{ widgets.footer(...) }}
+```