Update ReadMe

Update way to generate graphic on gnuplot.

Signed-off-by: Gustavo Toshi Komura <gtk10@c3sl.ufpr.br>
Include alloc of "Grade" in the time of execution

Signed-off-by: Gustavo Toshi Komura <gtk10@c3sl.ufpr.br>
Add tests on Makefile

Signed-off-by: Gustavo Toshi Komura <gtk10@c3sl.ufpr.br>
Add result of tests

Signed-off-by: Gustavo Toshi Komura <gtk10@c3sl.ufpr.br>