Base Board for Raspberry Pi Zero/Zero W

A prototype base-board for the Raspberry Pi Zero/ Zero W to address two issues that I have with using the Pi Zero W 1) Battery Backup: Although there are plenty of UPS hats available, I find them overly expensive. I have thus decided to do my own spin on that, which will hopefully be very successful. 2) Difficult access to the GPIO pins, as well as level conversion to make using 5v sensors a bit easier. This was addressed by adding 2 dedicated 8 channel level converter chips on the PCB, they can be individually enabled/disabled as needed. Further changes include adding dedicated power outputs (3v, 5v and ground) and grouping peripheral GPIO like SPI and I2c together for easy access. I have also added a dedicated shutdown button, to allow save headless operation.