How to add new item to Zotero?

bit_zsk
For now, there are a lot of items in zotero. Just as follow:
Zotero.CSL.Item._fallbackTypeMap = {
book:"book",
bookSection:"chapter",
journalArticle:"article",
magazineArticle:"article",
newspaperArticle:"article",
thesis:"article",
encyclopediaArticle:"chapter",
dictionaryEntry:"chapter",
conferencePaper:"chapter",
letter:"article",
manuscript:"article",
interview:"article",
film:"book",
artwork:"book",
webpage:"article",
report:"book",
bill:"book",
case:"book",
hearing:"book",
patent:"article",
statute:"book",
email:"article",
map:"article",
blogPost:"article",
instantMessage:"article",
forumPost:"article",
audioRecording:"book",
presentation:"article",
videoRecording:"book",
tvBroadcast:"article",
radioBroadcast:"article",
podcast:"article",
computerProgram:"book"
};
I want to extend the items. add some new ones. How to do that by programming or by adds on zotero.
Thanks very much if you can tell me the solution.

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