Add tutorial assignment files
Add skeleton files in `src/` directory and tests in `tests/` directory.
Signed-off-by: 
Razvan Deaconescu <razvan.deaconescu@upb.ro>
Add skeleton files in `src/` directory and tests in `tests/` directory.
Signed-off-by: Razvan Deaconescu <razvan.deaconescu@upb.ro>