add 01 MSA hello-world

01-MSA-hello-world/Makefile

+SYS:=none
+_SYS=$(addprefix .,$(SYS))
+MPICC=mpicc
+
+EXECS=mpi_hello_world$(_SYS).out
+
+.PHONY: all clean
+all: ${EXECS}
+
+mpi_hello_world$(_SYS).out: mpi_hello_world.c
+	${MPICC} -o $@ $<
+
+clean:
+	rm ${EXECS} *.out || true