New API controller for Rider model

[ErwanCheriaux]

add Rider class

• Id
• Name
• Age
• Country
• CreationDate

add Rider API controller

• GET /riders
• GET /riders/{id}
• POST /riders
• PUT /riders/{id}
• DELETE /riders/{id}

add a connection between Rider and Bike models

• Each bikes can have one rider by referring rider.Id