Update README.md

Added the Data section.

README.md

@@ -36,6 +36,46 @@ Project of a recommender system created with the Surprise framework. With a coll
 </ul>
 </details>
 
+## Data
+MovieLens data sets were collected by the GroupLens Research Project at the University of Minnesota.
+
+This data set consists of:
+- 100,000 ratings (1-5) from 943 users on 1682 movies. 
+- Each user has rated at least 20 movies. 
+- Simple demographic info for the users (age, gender, occupation, zip)
+
+Table: **u.item**
+
+| user id | item id | rating | timestamp |
+| -- | -- | -- | -- |
+| 196 | 242 | 3 | 881250949 |
+| 186 | 302 | 3 | 891717742 |
+| 22 | 377 | 1 | 878887116 |
+| 244 | 51 | 2 | 880606923 |
+| 166 | 346 | 1 | 886397596 |
+
+Table: **u.item**
+
+| movie id | movie title | release date | IMDb URL |
+| -- | -- | -- | -- |
+| 1 | Toy Story (1995) | 01-Jan-1995 | http://us.imdb.com/M/title-exact?Toy%20Story%20(1995) |
+| 2 | GoldenEye (1995) | 01-Jan-1995 | http://us.imdb.com/M/title-exact?GoldenEye%20(1995) |
+| 3 | Four Rooms (1995) | 01-Jan-1995 | http://us.imdb.com/M/title-exact?Four%20Rooms%20(1995) |
+| 4 | Get Shorty (1995) | 01-Jan-1995 | http://us.imdb.com/M/title-exact?Get%20Shorty%20(1995) |
+| 5 | Copycat (1995) | 01-Jan-1995 | http://us.imdb.com/M/title-exact?Copycat%20(1995) |
+
+Table: **u.user**
+
+| user id | age | gender | occupation | zip code |
+| -- | -- | -- | -- | -- |
+| 1 | 24 | M | technician | 85711 |
+| 2 | 53 | F | other | 94043 |
+| 3 | 23 | M | writer | 32067 |
+| 4 | 24 | M | technician | 43537 |
+| 5 | 33 | F | other | 15213 |
+
+Permalink: https://grouplens.org/datasets/movielens/100k/
+
 ## Contributing and Feedback
 Any kind of feedback/criticism would be greatly appreciated (algorithm design, documentation, improvement ideas, spelling mistakes, etc...).