Add RBAC for auth

[kd-digicraft]

• Roles Based Access Control to be added
• Make the roles and permissions easily configurable
• Each role will consist of a list of permissions
• Controllers will have decorators that work on permissions rather than roles
• For the sake of boilerplate - lets have roles -> admin, user
• Permissions to be -> ControllerGetAccess, ControllerPostAccess, ControllerPutAccess
• Admin will have all the permissions, whereas user will only have the ControllerGetAccess