Create database model

[muyunli123]

As an developer I need to create database model for recommendation API So that the recommendation data can be retrieved correctly by users

Details and Assumptions

The database model should contain 2 tables:

• Recommendation table: id of a basic product and a recommended product, and their recommendation type, e.g., cross-sell, up-sell, accessory

  Acceptance Criteria

  Given the table schemas 
  When database is created
  Then querying and transactions can be performed on the database

[agustdmybae]

Feedback from Prof: Creating one table is fine. We can directly use the Product service with the given product ID.