[Keyboard] Gray Studio Directory (#5002)

* move cod67 into the gray_studio directory

* modify readmes

keyboards/gray_studio/cod67/readme.md

@@ -0,0 +1,30 @@
+# Gray COD67
+
+The Gray COD67 is a 60% keyboard with a modern and bold design. It features 20 RGB Underglow LED lights and a unique diffuser placement. The COD67 has the most stunning RGB light strip for a custom mechanical keyboard. It also features a center mounted USB C port. 
+
+There were only 75 units made worldwide. 
+
+Keyboard Maintainer: [MechMerlin](https://github.com/mechmerlin)  
+Hardware Supported: Gray COD67  
+Hardware Availability: [Zfrontier](https://en.zfrontier.com/products/cod67)  
+
+At this time, flashing ONLY works on Windows systems. 
+
+To put in bootloader mode, hold the `Esc` key while plugging in the USB cable. 
+
+The COD67 will show up as a drive. 
+
+Make example for this keyboard (after setting up your build environment):
+
+    make gray_studio/cod67:default:bin
+
+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).
+
+Rename the resulting `.bin` file to `cod67.bin`.
+
+Drag and drop `cod67.bin` to the drive, overwriting the previous `cod67.bin` stored on it. 
+
+Press the `Esc` key again to reset the board. You are now ready to type!
+
+## Notes
+The backlight pin is attached to a non PWM pin `D4` so backlight is only on/off.