Add is0gr to QMK (#22024)

Co-authored-by: Duncan Sutherland <dunk2k_2000@hotmail.com>
Co-authored-by: Less/Rikki <86894501+lesshonor@users.noreply.github.com>

keyboards/cannonkeys/is0gr/info.json

@@ -0,0 +1,32 @@
+{
+    "manufacturer": "CannonKeys",
+    "keyboard_name": "is0GR",
+    "maintainer": "awkannan",
+    "bootloader": "stm32-dfu",
+    "diode_direction": "COL2ROW",
+    "features": {
+        "bootmagic": true,
+        "extrakey": true,
+        "mousekey": true,
+        "nkro": true
+    },
+    "matrix_pins": {
+        "cols": ["B3"],
+        "rows": ["A15"]
+    },
+    "processor": "STM32F072",
+    "url": "https://cannonkeys.com",
+    "usb": {
+        "device_version": "0.0.1",
+        "pid": "0xCA04",
+        "vid": "0x0028"
+    },
+    "community_layouts": ["ortho_1x1"],
+    "layouts": {
+        "LAYOUT_ortho_1x1": {
+            "layout": [
+                {"matrix": [0, 0], "x": 0.25, "y": 0, "w": 1.25, "h": 2}
+            ]
+        }
+    }
+}

keyboards/cannonkeys/is0gr/keymaps/default/keymap.c

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+// Copyright 2023 Andrew Kannan
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+  [0] = LAYOUT_ortho_1x1(
+    KC_ENT
+  ),
+};

keyboards/cannonkeys/is0gr/keymaps/via/keymap.c

@@ -0,0 +1,11 @@
+// Copyright 2023 Andrew Kannan
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include QMK_KEYBOARD_H
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+  [0] = LAYOUT_ortho_1x1(
+    KC_ENT
+  ),
+};
+

keyboards/cannonkeys/is0gr/keymaps/via/rules.mk

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+VIA_ENABLE = yes

keyboards/cannonkeys/is0gr/readme.md

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+# Alchemist Keyboards is0GR
+
+is0GR Keyboard
+
+Keyboard Maintainer: [Andrew Kannan](https://github.com/awkannan)  
+Hardware Supported: STM32F072CBT6 or equivalent  
+
+Make example for this keyboard (after setting up your build environment):
+
+    make cannonkeys/is0gr:default
+
+Flashing example for this keyboard:
+
+    make cannonkeys/is0gr: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 (on this board - it's the only key) and plug in the keyboard
+* **Physical reset button**: Bridge the two pads labeled "RESET" on the top of the PCB using some tweezers, and hold the tweezers there until the board enters the bootloader mode
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available (it isn't by default)

keyboards/cannonkeys/is0gr/rules.mk

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+# Wildcard to allow APM32 MCU
+DFU_SUFFIX_ARGS = -v FFFF -p FFFF