add mpi implementation of mandelbrot algorithm
add mpi implementation of mandelbrot algorithm

MNie/ComparisonOfOpenCLOpenMPMPI,MNie/ComparisonOfOpenCLOpenMPMPI,MNie/ComparisonOfOpenCLOpenMPMPI,MNie/ComparisonOfOpenCLOpenMPMPI,MNie/ComparisonOfOpenCLOpenMPMPI,MNie/ComparisonOfOpenCLOpenMPMPI,MNie/ComparisonOfOpenCLOpenMPMPI