Github Action for nvc++

[mrprajesh]

Currently, on GitHub actions, we know to compile programs using nvcc but not nvc++. Our make file builds nvc++ for parMDS, which we need a badge later on.

parMDS/Makefile

Lines 3 to 4 in d927ac8

	parMDS: parMDS.cpp
	nvc++ -O3 -std=c++14 -acc=multicore parMDS.cpp -o parMDS.out && ./parMDS.out toy.vrp -nthreads 20 -round 1