Content-based filtering

[ykymst]

• [x] Create function that calculate similarity among restaurants from preprocessed restaurants data matrix.
• [x] Loading similarity and user's evaluation, calculate recommendation scores.

[yasu52]

References https://ohke.hateblo.jp/entry/2017/10/13/230000 https://qiita.com/dacciinfo/items/f020e9162f6204bf5be6 https://yolo-kiyoshi.com/2020/08/26/post-2234/