Add Dynamic Recurrent Basket Model (DREAM)

[lthoang]

Description

Related Issues

https://github.com/PreferredAI/cornac/issues/579

Checklist:

• [ ] I have added tests.
• [x] I have updated the documentation accordingly.
• [x] I have updated README.md (if you are adding a new model).
• [x] I have updated examples/README.md (if you are adding a new example).
• [ ] I have updated datasets/README.md (if you are adding a new dataset).

[tqtg]

@lthoang are we actively working on this?

[lthoang]

@lthoang are we actively working on this?

Yes. I will be back to this model next week.