Add atset AT2 keyboard (#24099)

Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: jack <jack@pngu.org>
Co-authored-by: Joel Challis <git@zvecr.com>
Co-authored-by: zvecr <git@zvecr.com>

keyboards/atset/at2/keyboard.json

@@ -0,0 +1,32 @@
+{
+    "manufacturer": "Atset",
+    "keyboard_name": "AT2",
+    "maintainer": "qmk",
+    "board": "GENERIC_RP_RP2040",
+    "processor": "RP2040",
+    "bootloader": "rp2040",
+    "diode_direction": "COL2ROW",
+    "usb": {
+        "vid": "0x4141",
+        "pid": "0x6174",
+        "device_version": "1.0.0"
+    },
+    "features": {
+        "bootmagic": true,
+        "extrakey": true,
+        "mousekey": true,
+        "nkro": true
+    },
+    "matrix_pins": {
+        "cols": ["GP19", "GP20"],
+        "rows": ["GP28"]
+    },
+    "layouts": {
+        "LAYOUT": {
+            "layout": [
+                {"matrix": [0, 0], "x": 0, "y": 0},
+                {"matrix": [0, 1], "x": 1, "y": 0}
+            ]
+        }
+    }
+}

keyboards/atset/at2/keymaps/default/keymap.c

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+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include QMK_KEYBOARD_H 
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+    [0] = LAYOUT(
+        KC_MUTE, KC_MPLY
+    )
+};
+

keyboards/atset/at2/readme.md

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+# ATSET AT2
+
+A special 2 key keyboard powered by QMK.
+
+* Keyboard Maintainer: [ATSET](https://github.com/anubhavd7)
+* Hardware Supported: ATSET AT2 (https://imgur.com/a/yBbVwef)
+https://www.atsetmediscience.com/atset-at2-9949007.html
+Make example for this keyboard (after setting up your build environment):
+
+    make atset/at2:default
+
+Flashing example for this keyboard:
+
+    make atset/at2: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 (usually the top left key or Escape) and plug in the keyboard
+* **Physical reset button**: Briefly press the button on the back of the PCB - some may have pads you must short instead
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available