Added hardware docs

Signed-off-by: Seb Lee-Delisle <sebleedelisle@gmail.com>
Merge branch 'master' of github.com:sebleedelisle/freeservo
Merge branch 'master' of github.com:sebleedelisle/freeservo
Changed knobs to sliders.

Signed-off-by: Seb Lee-Delisle <sebleedelisle@gmail.com>
Merge branch 'master' of github.com:sebleedelisle/freeservo

Signed-off-by: Seb Lee-Delisle <sebleedelisle@gmail.com>

Conflicts:
	Arduino/DCServoWithSerialTuning/DCServoWithSerialTuning.ino
Re implemented PID send from arduino with prefix "PID:"

Signed-off-by: Seb Lee-Delisle <sebleedelisle@gmail.com>