coocCreate: make co-occurrence matrix
In ashther/ashtheR: check attence status on map

make co-occurrence matrix based on users or items

1	coocCreate(df, base = "item", method = "co_times")

`df`	dataframe about users , items and rating, if `method` is `co_times` or `jaccard`, users and items columns are need only.
`base`	`user` or `item`, difference collective filtering algorithm.
`method`	`co_times`, `jaccard` or `rating_sim`

co_times method will simpley get the co-occurrence times as result matrix cell value,
jaccard go one more step based on co_times method, it will caculate two items(or users) jaccard coefficient as matrix cell value,
rating_sim use algorithm made by myself, it uses rating rating ratio between two items(or users) rated by one user(or item) as matrix cell value.