Changes

'''On July 15th 2022, T208 is updated to T208 V1V2.2 0:''' * Improved power-path management avoids batteries discharging when power adapter connected* Improved Auto power-on reliability* Adds jumper selection (FON， Force ON) to disable auto power-off when Jetson Nano is not detected (see note1)* Removed jumper secleciton for PLD (Power loss detection), PLD is always enabled* Adds battery Reverse polarity protection circuit & LED indiciators Note1: If FON is enabled (jumper inserted), T208 cannot turn off automatically when Jetson Nano is released on turned off   '''On Augest 10th Augest, 2021, only T208 V1.2 is updated to added input surge protection circuit.'''