adds a new item to the tree

string add(object obj, [number index,string parentId] );
objobjectthe item object
indexnumberoptional, the position that the item will be added to (zero-based numbering)
parentIdstringoptional, the parent id
stringID of the newly added item


//inserts a new item into the branch with id='root'{id:"item10", value:"NewItem"}, 0, "root" );

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