Added 'create project' functionality and use-case
Added get_task and get_project use cases
Added mark_task usecase
Added Assign class to usecase
Added create_employee usercase
Fixed Completed Tasks in db to work for employees, too.
Added get_completed_tasks usecase
Finished out project show feature of client
Project History completed
Added get_assigned_tasks method to db
Added GetAssignedEmployees UseCase
Added list_employees functionality to db and usecase
Various bug fixes, show_employee_ongoing_tasks finished