Add Matrix 8XV1.2 OG rev1 PCB (#11614)

* add v1 12og pcb

* update

* matrix changes for testing

* Update matrix.c

* finalized files

* rename board versions

* update readmes

* typo in readme

* fix board filenames

* Update keyboards/matrix/m12og/rev1/rev1.c

Co-authored-by: Drashna Jaelre <drashna@live.com>

* change function

* update halconf and chconf

* merge master

* Update readme.md

* Update readme.md

* Update readme.md

Co-authored-by: Drashna Jaelre <drashna@live.com>

1 files changed, 26 insertions, 0 deletions

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+# Matrix 8XV1.2 OG keyboard
+
+![Matrix 8XV1.2 OG](https://i.imgur.com/NELL6Sbl.jpg)
+
+This was the Matrix 8XV1.2 OG keyboard made by the Matrix team.  
+Note: This firmware only supports ANSI only version (green/yellow PCB), and DOES NOT support the 8XV1.2 OG ISO/ANSI version.
+
+* Keyboard Maintainer: [kb-elmo](https://github.com/kb-elmo)
+* Hardware Supported: Matrix 8XV1.2 OG ANSI only PCB
+* Hardware Availability: Matrix Lab
+
+Make example for this keyboard (after setting up your build environment):
+
+    make matrix/m12og/rev1:default
+
+---
+**Bootloader:**  
+
+Hold down ESC while plugging in the keyboard. The board will show up as a mass storage device on your computer. Drag and drop the compiled firmware .bin file into it. The board will automatically reset and load the new firmware.  
+
+:no_entry: **DO NOT DO THIS ON A MAC OS SYSTEM! IT WILL PERMANENTLY BRICK THE KEYBOARD!!!**
+
+---
+
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).