includes go-rpi-rgb-led-matrix as a dep

go-rpi-rgb-led-matrix/lib/rpi-rgb-led-matrix/adapter/README.md

@@ -0,0 +1,23 @@
+PCB adapter for Raspberry Pi to Hub75 RGB Matrixes
+==================================================
+
+Since hand-wiring can be a little tedious, here are some PCBs that help
+with the wiring when using the `rpi-rgb-led-matrix` code.
+
+   * [Passive-3](./passive-3) Supports three parallel chains, directly connected
+     to the output of a Rapsberry Pi with 40 GPIO pins. Works, but usually it is better to
+     buffer the outputs using the ...
+   * [Active-3](./active-3) board. Supports three parallel chains with active buffering
+     and 3.3V -> 5V level shifting for best reliability. Requires SMD soldering.
+     
+     As another option you can buy it from these locations not affiliated with this project.
+     They are given to help you locate premade boards but no guarantees are given or implied:
+     * https://www.electrodragon.com/product/rgb-matrix-panel-drive-board-raspberry-pi/
+       ($3/board, but fairly long and/or expensive shipping from HKG)
+     * Seller #2 (fill me)
+   * The [Passive-RPi1](./passive-rpi1) adapter board is to connect one panel to
+     Raspberry Pi 1 with 26 GPIO pins.
+
+![Three Panels connected][three-panels]
+
+[three-panels]: ../img/three-parallel-panels-soic.jpg