added servo stepper content from IAP.17

servo-stepper/css/style.css

servo-stepper/fw/host.py

servo-stepper/fw/serial.h

servo-stepper/fw/servo-stepper.c

servo-stepper/fw/servo-stepper.c.hex

servo-stepper/fw/servo-stepper.make

servo-stepper/img/ADC_impedance.png

servo-stepper/img/as5311.png

servo-stepper/img/awex-dti2-traces.png

servo-stepper/img/awex-dti4-traces.png

servo-stepper/img/capacitive-calipers-mitutoyo.jpg

servo-stepper/img/capacitive-patent-mitutoyo.png

servo-stepper/img/flying-and-dual-sense.png

servo-stepper/img/fwd_rev_decay_LVSCP9.png

servo-stepper/img/hall_encoder_austrian.png

servo-stepper/img/hybrid-stepmotor-diagram-2.png

servo-stepper/img/hybrid-stepmotor-diagram.png

servo-stepper/img/mechaduino_board_diagram.png

servo-stepper/img/mechaduino_motor.jpg

servo-stepper/img/mosolver-internals.jpg