Added data

drivers/pid_playground/ABB_Linear.png

drivers/pid_playground/TemperatureFrequency.png

drivers/pid_playground/Ziegler_Nichols.png

drivers/pid_playground/Ziegler_Nichols_LA.png

drivers/pid_playground/Ziegler_Nichols_LA_hKi.png

drivers/pid_playground/Ziegler_Nichols_LA_hKiKd.png

drivers/pid_playground/Ziegler_Nichols_LA_hKiKdKp.png

drivers/pid_playground/Ziegler_Nichols_LA_mod1.png

drivers/pid_playground/Ziegler_Nichols_LA_tKi.png

drivers/pid_playground/Ziegler_Nichols_PI.png

drivers/pid_playground/background.txt

drivers/pid_playground/background_curtainup.png

drivers/pid_playground/chamber_abb_linear.txt

drivers/pid_playground/chamber_cohen_coon.txt

drivers/pid_playground/chamber_curtainup.txt

drivers/pid_playground/chamber_heating_test.txt

drivers/pid_playground/chamber_multisensor_test.txt

drivers/pid_playground/chamber_response_0V2.txt

drivers/pid_playground/chamber_response_0V25.txt

drivers/pid_playground/chamber_response_0V35.txt