a simulation similar to the Washington Post one but with mortality
##TO DO LIST -create a death method to Particle class (does it turns into some color or desappear?)
-calculate a local "mortality mean rate" taking into consideration the demographic info of São Paulo -implement mortality rate (how?)
-plot #healthy, #sick, #recovered, #dead vs time -add it into the same window of the simulation
-recalculate "mortality mean rate" with data of countries that handled badly and well crisis
-rerun the simulation with different % of social isolation people (speed == 0)
-rerun the simulation without graphic display to average results