adding the empty cider js

the express-markdown doesn't meet allt he requriements i need. .e.g
parse the markdown or parsed mardown to proper structured data and
passing back to express as things like DOM, but I would define it as
cider data structure. e.g.
{
"title": "",
"toc": "", // table of content
"content": ""
}

via this, I can properly layout and markup the page in a btter way of
outputing documents.