[Keyboard] Add Churrosoft Deck-8 (#21119)

Co-authored-by: Albert Y <76888457+filterpaper@users.noreply.github.com>
Co-authored-by: jack <0x6a73@protonmail.com>

keyboards/churrosoft/deck8/noleds/readme.md

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+# Churrosoft Deck-8 (No LEDs version)
+
+![ChurroDeck-8](https://i.imgur.com/NNmq8hzh.png)
+
+A small 8-key macropad
+
+* Keyboard Maintainer: [Polsaker](https://github.com/Polsaker)
+* Hardware Supported: ChurroDeck PCV rev. 1b, 1c and 1d
+* Hardware Availability: [churrosoft.ar](https://churrosoft.ar/deck)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make churrosoft/deck8/noleds:default
+
+Flashing example for this keyboard:
+
+    make churrosoft/deck8/noleds:default:flash
+
+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 3 ways:
+
+* **Bootmagic reset**: Hold down the key at (0,0) in the matrix (the top left key) and plug in the keyboard
+* **Physical reset button**: Short the `JP1` jumper in the back side of the PCB.
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available

keyboards/churrosoft/deck8/noleds/rules.mk

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+# This file intentionally left blank