core: enable simplemde as a text editor

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/Preference_getAvailableTextEditorList.py

@@ -6,4 +6,7 @@ if getattr(context.portal_skins, "erp5_code_mirror", None) is not None:
 if getattr(context.portal_skins, "erp5_monaco_editor", None) is not None:
   text_editor_list.append(("Monaco Editor", "monaco"))
 
+if getattr(context.portal_skins, "erp5_simplemde", None) is not None:
+  text_editor_list.append(("Simple Markdown Editor", "simplemde"))
+
 return text_editor_list

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/gadget_editor.js.js

@@ -9,6 +9,7 @@
     "onlyoffice": {"url": "onlyoffice.gadget.html"},
     "fck_editor": {"url": "ckeditor.gadget.html"},
     "html_viewer": {"url": "gadget_html_viewer.html"},
+    "simplemde": {"url": "simplemde.gadget.html"},
     "svg_editor" : {"url": "method-draw/method-draw.gadget.html"},
     "minipaint": {"url": "minipaint.gadget.html"},
     "jquery-sheets": {"url": "jquery-sheets.gadget.html"},