Add datasheets to repository

 Changes to be committed:
	new file:   datasheets/29-FOTEK-SSR-xx.pdf
	new file:   datasheets/DS18B20.jpg
	new file:   datasheets/DS18B20.pdf
	new file:   datasheets/LM7805.pdf
	new file:   datasheets/MotorSpeedControlSchematic.gif
	new file:   datasheets/PN2222.pdf
	new file:   datasheets/adafruits-raspberry-pi-lesson-11-ds18b20-temperature-sensing.pdf
	new file:   datasheets/astrom-ch6.pdf
	new file:   datasheets/solid_state_relay_switch.pdf