fix: csv-importer (#10)

* update item fields to support import_ref

* add additional rows to CSV importer

* add CSV import documentation

* update readme

* update readme

* fix failed test

docs/mkdocs.yml

@@ -27,3 +27,17 @@ theme:
 
 extra_css:
   - assets/stylesheets/extras.css
+
+markdown_extensions:
+  - pymdownx.emoji:
+      emoji_index: !!python/name:materialx.emoji.twemoji
+      emoji_generator: !!python/name:materialx.emoji.to_svg
+  - def_list
+  - pymdownx.highlight
+  - pymdownx.superfences
+  - pymdownx.tasklist:
+      custom_checkbox: true
+  - admonition
+  - attr_list
+  - pymdownx.tabbed
+  - pymdownx.superfences