Create Reviews model, migrations, and seeders

[yoshelb]

• [x] Model name is Review
• [x] table name is Reviews
• [x] table attributes: npx sequelize-cli model:generate --name Review --attributes spotId:integer,userId:integer,review:string,stars:integer
• [x] find all constraints/ validations and add them to Model and migration
• [x] add options object to migrations and seeders
• [x] define associations
• [ ] add validations to Expressvalidator
• [x] Create seeders
• [ ] express validator messages: "review": "Review text is required", "stars": "Stars must be an integer from 1 to 5",