custom file type list when creating new file

  "comment": "设置新建笔记时的笔记类型列表",
    "new_file_types": [{
        "display_name": "Markdown",
        "file_extension": "md"
    },{
        "display_name": "reStrucutred Text",
        "file_extension": "rst"
    },{
        "display_name": "Org-mode",
        "file_extension": "org"
    },{
        "display_name": "Custom",
        "file_extension": ""
    }],