[Keyboard] Add Pearlboards boards to directory (#15005)

Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/pearlboards/atlas/readme.md

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+# Atlas
+
+![Atlas](https://i.imgur.com/jm6DyWAh.jpg)
+
+Atlas is a timeless Greek themed 65 percent keyboard. The construction uses 6061 alu, pvd coated brass/stainless steel and dyed polycarbonate. The finishes include e-coating, anodizing, micro arc anodization, metal polish and fine beadblasting. Layouts are limited to a few ANSI variations such as tsangan/wkl and ISO. The keyboard also has a usb-c daugtherboard, an integrated dual usb hub with an audio jack and dac, and a rotary encoder. The case has indicator lights and is gasket mounted. The pcb is designed by me in house and has some super cool tricks up its sleeve as well.
+
+* Keyboard Maintainer: Koobaczech
+* Hardware Supported: Koobaczech
+* Availability: https://pearlboards.net/products/atlas65
+
+Make example for this keyboard (after setting up your build environment):
+
+    make pearlboards/atlas:default
+
+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).
+
+## Bootloader
+
+Enter the bootloader in 2 ways:
+
+* **Physical reset button**: Briefly press the button on the back of the PCB labeled "RESET"
+* **Keycode in layout**: Press the key mapped to `RESET` in conjunction with the key mapped to `MO(1))`