Add 1-marketplace assignment

assignments/1-marketplace/skel/README

assignments/1-marketplace/skel/check_test.py

assignments/1-marketplace/skel/pylintrc

assignments/1-marketplace/skel/run_tests.sh

assignments/1-marketplace/skel/tema/consumer.py

assignments/1-marketplace/skel/tema/marketplace.py

assignments/1-marketplace/skel/tema/producer.py

assignments/1-marketplace/skel/tema/product.py

assignments/1-marketplace/skel/test-gen/README_TESTS

assignments/1-marketplace/skel/test-gen/generate_tests.sh

assignments/1-marketplace/skel/test-gen/test_generator.py

assignments/1-marketplace/skel/test-gen/test_utils.py

assignments/1-marketplace/skel/test.py

assignments/1-marketplace/skel/tests/01.in

assignments/1-marketplace/skel/tests/01.json

assignments/1-marketplace/skel/tests/01.ref.out

assignments/1-marketplace/skel/tests/02.in

assignments/1-marketplace/skel/tests/02.json

assignments/1-marketplace/skel/tests/02.ref.out

assignments/1-marketplace/skel/tests/03.in