Brackets for led matrix

This bracket fits the [64x32 RGB LED Matrix - 6mm pitch](https://www.adafruit.com/product/2276) from Adafruit.

I am using this display with an [Adafruit Matrix Portal](https://www.adafruit.com/product/4745),
but wanted to move the
board further inside and needed a harness to hold it while connecting
it to the HUB 75 plug using [jumper wires](https://smile.amazon.com/Elegoo-EL-CP-004-Multicolored-Breadboard-arduino/dp/B01EV70C78/ref=pd_sbs_1?pd_rd_w=VCvAo&pf_rd_p=2419a049-62bf-452e-b0d0-ca5b7e35a7b4&pf_rd_r=Q2HE935KPQS32PKH8ZBT&pd_rd_r=f78c02c9-5f40-421d-bb21-1b7b724c5086&pd_rd_wg=2rhGP&pd_rd_i=B01EV70C78&psc=1).

[Adafruit Matrix Portal - CircuitPython Powered Internet Display](https://www.adafruit.com/product/4745)

I will be hanging it on the wall to replace my existing kitchen clock.
8 x M3 10mm screws are required to connect the brackets to the display.

In order to protect and diffuse the LEDs, I ordered the
Black LED Diffusion Acrylic Panel from [tapplastics.com](ht