Add hello --> world example

02-MSA-hello-world-gpu/Makefile

02-MSA-hello-world-gpu/hello-world.c

02-MSA-hello-world-gpu/hello-world.cu

02-MSA-hello-world-gpu/job_msa_juwels.sh

03-MSA-ping-pong/Makefile

03-MSA-ping-pong/README.md

03-MSA-ping-pong/compile.sh

03-MSA-ping-pong/job_msa_jureca.sh

03-MSA-ping-pong/job_msa_juwels.sh

03-MSA-ping-pong/ping-pong.c

03-MSA-ping-pong/ping-pong.cu