Set the collation to "utf8_general_ci".

Signed-off-by: Marios Sotiropoulos <mai1211@uom.edu.gr>
Create model classes and migrations.

Signed-off-by: Marios Sotiropoulos <mai1211@uom.edu.gr>
Add classes AuthorizationRequest and AuthorizationResponse.

Signed-off-by: Marios Sotiropoulos <mai1211@uom.edu.gr>
Implement the "Client Registration" use case.

Signed-off-by: Marios Sotiropoulos <mai1211@uom.edu.gr>
Issue authorization codes.

Signed-off-by: Marios Sotiropoulos <mai1211@uom.edu.gr>