tema2: add checker

assignments/2-cuda_proof_of_work/.gitlab-ci.yml

assignments/2-cuda_proof_of_work/Dockerfile

assignments/2-cuda_proof_of_work/checker/Makefile

assignments/2-cuda_proof_of_work/checker/batch_build.sh

assignments/2-cuda_proof_of_work/checker/batch_clean.sh

assignments/2-cuda_proof_of_work/checker/checker.sh

assignments/2-cuda_proof_of_work/checker/input/test0

assignments/2-cuda_proof_of_work/checker/output/test0.ref

assignments/2-cuda_proof_of_work/local.sh

assignments/2-cuda_proof_of_work/src/cpu_miner/Makefile

assignments/2-cuda_proof_of_work/src/cpu_miner/README.md

...ments/2-cuda_proof_of_work/src/cpu_miner/include/sha256.h

...nments/2-cuda_proof_of_work/src/cpu_miner/include/utils.h

...nments/2-cuda_proof_of_work/src/cpu_miner/src/cpu_miner.c

assignments/2-cuda_proof_of_work/src/cpu_miner/src/sha256.c

assignments/2-cuda_proof_of_work/src/cpu_miner/src/utils.c

assignments/2-cuda_proof_of_work/src/gpu_miner/Makefile

assignments/2-cuda_proof_of_work/src/gpu_miner/README.md

...nts/2-cuda_proof_of_work/src/gpu_miner/include/sha256.cuh

...ents/2-cuda_proof_of_work/src/gpu_miner/include/utils.cuh